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【单选题】

在光滑表面或薄工件表面上冲眼要( )。(钳工基础)

A.
浅些
B.
深些
C.
密些
D.
稀些
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】钳工师傅在刃磨麻花钻时,要经常在水槽内进行冷却降温,其目的是:

A.
防止钻头因为磨削温度过高烫伤手掌
B.
防止钻头因为磨削温度过高而变形
C.
防止钻头因为磨削温度过高而使其磨削后硬度降低
D.
使钻头淬火,提高其硬度

【单选题】In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civilization from the faces...

A.
any way, the face-recognition technology is good enough to frighten the terrorists
B.
the industry will have to recognize the real situation and work hard to improve the technology
C.
all the claims are premature
D.
we must not expect too much