键联接中因键强度不够而被破坏是由（）引起的。
A.挤压
B.剪切
C.扭转
D.弯曲
参考答案：B
钢筋的型号是以( )表示的。
A．外径B．内径C．计算直径D．平均直径
The company’s training plan was designed to help the employees to improve their work habits and ______.
A. proficiency B. sufficiency C. insufficiency D. efficiency
