You can go out _____ you promise to be back before 11 o’clock.
A. so that
B. as far as
C. so long as
D. in case
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I’d like to have a try, ____ I may fail.
A. since
B. though
C. until
D. after
汽转动汽车方向盘时,汽车方向盘操纵杆( )变形。
A. 弯曲
B. 轴向拉伸
C. 扭转
D. 剪切
按右手螺旋法则,以拇指代表截面的外法线方向,则四指转向相同的扭矩为正。
A. 对
B. 错
各种产生扭转变形的构件,其在变形方面特点是受扭转构件的各横截面都绕杆轴线发生相对转动。
A. 对
B. 错