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【单选题】
下列各组硫化物中 ,难溶于稀 HCl 但可溶于浓HCl 的是 ( )A.
Sb 2 S 3 和 CdS
B.
Ag 2 S 和 Bi 2 S 3
C.
CoS 和 PbS
D.
As 2 S 3 和 NiS
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【简答题】The normalizing temperatures of hypoeutectoid stells are.
【判断题】Spheroidizing is to improve the machinability of the annealed hypoeutectoid steel by producing a spheroidal or globular form of a carbide in a ferritic matrix which makes the machining easy.
A.
正确
B.
错误
【单选题】Researchers at Children' s Hospital of Pittsburgh announced they had discovered ______ evidence that a virus is involved in what used to be called juvenile diabetes.
A.
incessant
B.
compelling
C.
identical
D.
problematic
【简答题】In a hypoeutectoid steel,both eutectoid and proeutectoid ferrite exist.Explain the different between them.What will be the carbon concentration in each.
【单选题】The organizational pattern of this passage is one of______.
A.
generalization-evidences
B.
evidences-generalization
C.
generalization-evidences-generalization
D.
evidences-generalization-evidences
【单选题】Hawthorne generally concerned himself with such issues as ______ in his fictions.
A.
the evil in man's heart
B.
the material pursuit
C.
the racial conflict
D.
the social inequality
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