题目内容
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A small dam of height h=2.0m is constructed of vertical wood beams AB of thickness t = 120 mm , as shown in the figure. Consider the beams to be simply supported at the top and bottom. Determine the maximum bending stress
in the beams, assuming that the weight density of water is
.
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第1题
A. They can divert the rivers.
B. They can fix more problems than they create.
C. They are built to irrigate farmland.
D. They may have brought on ecological crisis.
第2题
A．No economic thinker could be more honorable.
B．Cash is very versatile and enduring.
C．We will not need money in the near future.
D．Electronic money will replace cash in the future.
第3题
A．No economic thinker could be more honorable.
B．Cash is very versatile and enduring.
C．We will not need money in the near future.
D．Electronic money will replace cash in the future.
第4题
A．No economic thinker could be more honorable.
B．Cash is very versatile and enduring.
C．We will not need money in the near future.
D．Electronic money will replace cash in the future.
第5题
The charges were announced by Judge Raed Juhi, chief investigative judge of the tribunal. They are connected with a 1982 series of detentions and executions after an assassination attempt on Saddam in Dujayl.
Charges against five other men were announced in February. The men will not be tried individually.
"With this announcement, the [tribunal] has raised this historic trial to a new level where the accused stands before justice which will rely on evidence," Juhi said.
No trial date was announced, but under Iraqi law Saddam could stand trial as early as September, because of a minimum 45-day period following referral for trial.
On July 8, 1982, a convoy carrying Saddam traveled through the town of Dujayl, a Shiite village north of Baghdad, and was attacked by a small band of residents.
A series of detentions and executions in the town followed the incident. According to the tribunal, 15 people were summarily executed and some 1,500 others spent years in prison with no charges and no trial date. Ultimately, another 143 were put on "show trials" and executed, according to the tribunal.
Speaking from Rome, Italy, an attorney for Saddam questioned whether a trial would ever be held at all.
"As of today, we still do not have a single document purporting to be anything where we can be ready for trial, and after their own rules ... we will require ... time to be able to prepare a defense," said Giovanni di Stefano. "Anything other than that would make it a farce."
Which institute has brought its first charges against Saddam Hussein?
A．The Iraqi government.
B．The Iraqi state council.
C．The Iraqi Special Tribunal.
D．The U.S. military court.
第6题
第7题
Drug-vaccine therapy may be lifesaver for Deerfield man. Few people survive advanced melanoma, but immune therapy is giving Deerfield resident Douglas Parker a fighting chance. The 46-year-old salesman noticed a mole on his chest three and a half years ago that was found to be cancerous. Doctors removed the mole but didn't get all of the cancer. The cancer spread to other parts of his body, including his liver, where a tumor grew as large as a baseball. Parker took interferon and interleukin-2 to boost his immune system's ability to fight the cancer. The tumor shrank but didn't disappear. In August, 1997, surgeons removed it, along with two-thirds of his liver. Last January, doctors discovered a new tumor on Parker's left adrenal gland. He received an experimental cancer vaccine at the University of Chicago Hospitals, but the vaccine didn't stop the cancer from spreading to his right adrenal gland.
To augment the vaccine, doctors at Lutheran General Hospital gave Parker a new round of interleukin-2 and interferon. The drug-vaccine combination has shrunk the tumors. And while it's too early to pronounce Parker cured, immune therapy may save his life. "I want to do this to help myself as well as other people who have melanoma, ' he said.
Immune therapy "ultimately will be a significant change in the way we treat a lot of different cancers," said Dr. Jon Richards of Lutheran General Hospital in Park Ridge, who is testing cancer vaccines on melanoma patients. "It will be an equal partner with the other three treatments in the next five to ten years." Several drugs that bolster the immune system have been approved, and vaccines are being tested in dozens of clinical trials, including several in the Chicago area. Many of the experimental vaccines have been tested on patients with advanced melanoma who have little chance of surviving with conventional treatments alone. Researchers also have begun doing work that could lead to vaccines to treat prostate, lung, colon and other cancers.
Immune therapy alone won't cure cancer. But when used after conventional treatments, it could kill cancer cells that survive surgery, radiation or chemotherapy, researchers said. Some day, vaccines also might be able to prevent certain cancers. It may be possible to vaccinate against viruses and bacteria that help cause cervical, liver and stomach cancers, the National Cancer Institute said.
The "fourth weapon" cures cancer by______.
A．replacing cancerous cells
B．boosting the immune system
C．killing cancer cells directly
D．quickening the reproduction of cells
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