对直接承受动荷载而且可能在负温下工作的重要钢材结构，必须进行( )检验。
A．抗拉性能
B．冷弯性能
C．冲击韧性
D．耐疲劳性
参考答案：C
为下列句子选择正确图片。
( ) 1. I'm going to the USA by plane.
( ) 2. They're going to the park by ship.
( ) 3. She is going home by subway.
( ) 4. She is going to school by bike.
( ) 5. He is going to work by bus.
( ) 6. Mike is going to take a trip by train.
绘画兴趣班、书法兴趣班共有学生60名，因故把书法兴趣班12名学生调到绘画兴趣班，这时绘画兴趣班的人数是书法兴趣班的2倍。绘画兴趣班原有学生( )
A．28
B．30
C．32
D．36
