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问题 单项选择题

钻机绞车带式刹车的包角可达（）。

A.270º一330º

B.250º一270º

C.200º一250º

D.330º一350º

答案

参考答案：A

问答题

商鞅变法的意义和成功的原因你认为有哪些？

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                           

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多项选择题

工作轮班制的主要组织形式有( )。

A．混合制

B．三班制

C．四班制

D．两班制

E．交叉制
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