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【单选题】
不对称的弯曲件,弯曲时应注意A.
防止回弹;
B.
防止偏移 ；
C.
防止弯裂 ；
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举一反三
【单选题】We have an annealed carbon steel which has hardness of 150HBS. Suppose we know the hardness of Pearlite is 200HBS and the hardness of Ferrite is 80HBS, determine the carbon amount of this steel.
A.
(a) 0.45%
B.
(b) 0.8%
C.
(c) 1.2%
D.
(d ) 0.2%
【单选题】What does the man say about the criticism of technology?
A.
He should ignore the criticism.
B.
We need to consider what technology may bring us.
C.
He feels bad about the criticism.
D.
He thinks the criticism is far-fetched.
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