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【单选题】
诊断宫外孕的辅助检查中,不适宜的是A.
B 超检查
B.
宫颈刮片
C.
阴道后穹隆穿刺
D.
盆腔检查、腹部检查
E.
腹腔镜检查
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举一反三
【简答题】12 填空 is the predominant alloying element of Brass.
【单选题】 Manganese as an alloying element in alloy steels is used principally to
A.
Improve hardenability
B.
Improve mechanical properties at low or elevated temperatures
C.
Improve the corrosion and oxidation resistance
D.
Increase the machinability
【简答题】Describe the mechanisms by which alloying effects affect hardenability.
【简答题】How to improve the corrosion-resistance of a steel by alloying?And what measures should we take to increase the strength of stainless steels?
【简答题】With the exception of , all alloying elements raise the hardenability of steels..
【单选题】One of the most common techniques is to add alloying elements that inhibit the corrosion.
A.
restrain
B.
retain
C.
relieve
D.
repulse
【简答题】Some alloying elements are known a‘carbide formers’.What does this term mean?Beyond this,some elements are called very strong,strong or moderate carbide formers.What is meant by this?
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