图(a)所示圆截面杆AB左端固定,承受均布力偶作用,集度为qt=20N·m/m,已知直径D=20mm,杆长l=2m,材料的切变模量
图(a)所示圆截面杆AB左端固定,承受均布力偶作用,集度为qt=20N·m/m,已知直径D=20mm,杆长l=2m,材料的切变模量G=80GPa,许用切应力[τ]=30MPa,单位长度的许用扭转角[θ]=2°/m,试进行强度和刚度校核,并计算扭转角φBA。
图(a)所示圆截面杆AB左端固定,承受均布力偶作用,集度为qt=20N·m/m,已知直径D=20mm,杆长l=2m,材料的切变模量G=80GPa,许用切应力[τ]=30MPa,单位长度的许用扭转角[θ]=2°/m,试进行强度和刚度校核,并计算扭转角φBA。
第1题
M: No, I'm not. I'm afraid of breaking my neck. So I'd rather be a bus commuter.
Q: Why won't the man learn to drive?
(15)
A.Because driving is too dangerous.
B.Because buying a car is too expensive.
C.Because getting a driver's licence is too difficult.
D.Because taking a bus is more convenient.
第2题
A.He refused to drive her.
B.He is glad to drive her.
C.He forgot his driver's license.
D.He has a new car.
第3题
A.He refused to drive her.
B.He has a new car.
C.He forgot his driver's license.
D.He is glad to drive her.
第4题
A.He refused to drive her.
B.He is glad to drive her.
C.He forgot his driver's license.
D.He has a new car.
第5题
What does the man have to do in order to drive legally?
A.Show his student ID and pay ten dollars.
B.Use his international driver's license.
C.Take a driver’s test and apply for a limited license.
D.Show proof of temporary residence.
第6题
What does the man have to do in order to drive legally?
A.Show his student ID and pay ten dollars.
B.Use his international driver's license.
C.Take a driver's test and apply for a limited license.
D.Show proof of temporary residence.
第7题
The course is divided up into two parts: class time for learning laws and regulations and driving time to practice driving. Each student is required to drive a total of six hours. The students are divided up into groups of four. The students and the instructor go out driving for two hour blocks of time. Thus, each student gets half an hour driving time per outing. Drivers Ed cars are unlike other cars in which they have two sets of brakes, one on the driver's side and one on the other side where the instructor sits. Thus, if the student driver should run into difficulties the instructor can take over.
After a student has passed the driver's education course and reached the appropriate age to drive (this age differs in every state but in most cases the person must be 16 years old), he must take his driver's test. The person must pass all three tests in order to be given a driver's license. If the person does well in his or her driver's education class, he or she will pass the test with flying colors and get a driver's license.
In America, the driver's course mentioned above______.
A.is considered as part of the advanced education
B.is given to anyone wanting to get a driver's license
C.is carried on after students graduate from high school
D.is offered to all the students of Grade 2 in high school
第8题
A. Showing a map of the region a driver plans to drive through.
B. Predicting a car crash on the road.
C. Getting information about road construction, weather conditions, and traffic jams.
D. Showing the car’s position at all times and displaying it on the map.
第9题
第10题
A.She should call the taxi herself.
B.The taxi driver is a friend of his.
C.He's taking the same bus she is.
D.He'll drive her to the bus station.
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