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【单选题】

粗糙表面比光滑表面容易腐蚀的原因有()个。

A.
B.
C.
D.
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参考答案:
参考解析:
.
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举一反三

【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