带传动的缺点是（）
A.轴向力大
B.传动的外廓尺寸较大
C.易发热
D.只能单向传动
参考答案：B
- May I go to the movies with you?
- I’m afraid not you have a ticket, because I have only one.
A． if B. unless C. though
(55—57题共用备选答案)
肱骨干中、下1／3处骨折常引起
A．肱动脉损伤B．桡动脉损伤C．尺神经损伤D．股骨转子骨折E．旋股内、外动脉损伤
