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【多选题】
刀具切削部分的材料应具备哪些性能。A.
高硬度和高耐磨性
B.
足够的强度和韧性
C.
高的耐热性
D.
较好的工艺性
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反馈参考答案：
举一反三
【单选题】Sodifficult it towork out the proble
A.
33. Sodifficult it towork out the problem that I decided to ask Tom for advice. （广东 ) A. I did find
B.
did Ifind
C.
I havefound
D.
have Ifound
【单选题】--- I can’t repair these until tomorrow, I’m afraid. --- That’s OK, there’s ____________.
A.
no problem
B.
no wonder
C.
no doubt
D.
no hurry
【简答题】He was within an () of solving the proble
【单选题】It wasn’t until dark _________ he found _________ he thought was the correct way to solve the problem.
A.
when , that
B.
that , that
C.
when , what
D.
that , what
【单选题】--- I can’t repair these until tomorrow, I’m afraid. --- That’s OK, there’s ____________.
A.
no problem
B.
no wonder
C.
no doubt
D.
no worry
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