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【单选题】
鉴别水杨酸及其盐类,最常用的试剂是:
A.
碘化钾
B.
碘化汞钾
C.
三氯化铁
D.
硫酸亚铁
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A.
Stomac h
B.
Live r
C.
Heart
D.
Lung
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A.
正确
B.
错误
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A.
独立电子近似;
B.
自由电子近似;
C.
弹性碰撞近似;
D.
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A.
15d
B.
20d
C.
28d
D.
30d
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【多选题】Ginzburg-Landau理论有三个基本假设是()
A.
存在一个有序参量Ψ,这个在相变时Ψ为零
B.
自由能可以按Ψ的幂次展开
C.
展开式中的系数是T的有规律的函数
D.
超导电子密度在相变时发生跃变
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