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问题 单项选择题

外圆磨床的工作台一般采用什么传动（）

A.齿轮、齿条传动

B.蜗杆、蜗轮传动

C.液压传动

答案

参考答案：C

选择题
— Why were you wet through when you came to the meeting?
— Because I _____ in the gym.

A. work out
B. had been working out
C. was working out
D. had been worked out
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单项选择题 A1/A2型题

静注硫酸镁过量引起的毒性不含（）

A.呼吸抑制

B.腱反射消失

C.心脏抑制

D.血压骤降

E.痉挛
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