-Tom didn't go to school,did he?[ ] A. Y_爱下问搜题

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问题选择题

-Tom didn't go to school, did he?

[ ]

A. Yes, he does

B. No, he didn't

C. Yes, he didn't

D. No, he did

答案

答案：B

单项选择题

现有甲、乙、丙、丁四种方案，其功能评价系数分别为0.24、0.18、0.22、0.36；其成本指数分别为0.288、0.126、0.164、0.422。则最优的方案为（）。

A．甲

B．乙

C．丙

D．丁

单项选择题

驱动轮轮衬磨损余厚不小于原厚度（），否则应及时更换轮衬。

A.1/3

B.2/3

C.1/2