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【多选题】
下列不属于甲真菌病表现特点的是( )A.
指（趾）甲顶针样改变
B.
20 个甲板全部受累，受累的严重程度相同，且同时发病
C.
甲板表面光滑，自幼发病，有明确的家族史
D.
甲根部残留的甲板呈长条放射状紧贴甲床上
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举一反三
【简答题】线性电感元件是指电感量L为______的电感。
【单选题】加在感抗 X L =10 Ω 纯电感两端的电压 u L = 20sin （ ωt+π/6 ） V ，则通过它的电流是（ ）。
A.
i L =2sin （ ωt+π/3 ） A ;
B.
i L =2 sin （ ωt-π/3 ） A ;
C.
i L = 2sin （ ωt+π/6 ） A ;
D.
i L = 2sin （ ωt-π/6 ） A ;
【单选题】Read the text of UNIT 2 Neat People vs. Sloppy People, what's the writer's purpose of writing this passage?
A.
Compare the differences between neat people and sloppy people
B.
Discuss the causes of difference between neat people and sloppy people
C.
To disprove the conventional attitudes toward neat people and sloppy people
D.
Criticize neat people for their insensitivity.
【简答题】两电感元件L 1 和L 2 并联，求其等值电感；若将L 1 和L 2 串联，再求其等值电感。
【简答题】流动电感L的电流从0升至I时，电感L吸收的磁场能为()。
【简答题】sloppy ___________
【单选题】According to the passage, sloppy writing ______.
A.
parallels a social tendency of being informal
B.
worries students as well as professors
C.
is taken as trivial by employers
D.
is ignored in all business concerned sciences
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