www.nwu.edu.cn是Internet中主机的域名。

A、无线电

B、红外线

C、卫星

D、微波

A、1800Hz

B、50Hz

C、19200Hz

D、600Hz

Read the text and decide the function of the 1st sentence in the text. Managers will often put a CV on the rejection pile for any number of reasons. This is not something one should take personally. It happens because they will receive hundreds of applications for a job and need a way to cut that number down quickly to the twenty or so they intend to interview. The list is obviously endless, but includes major gaps, such as lack of qualifications, and minor oversights, such as spelling errors. What is the function of the 1st sentence in the text?

A、supporting reason

B、topic sentence

C、example

D、summary

双筋矩形截面承载力计算时，若，则令,用近似式计算其抗弯承载力。