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【单选题】
一个半波整流电路的变压器二次电压为10 V,负载电阻为500Ω,流过二极管的平均电流为( )。
A.
90 mA
B.
180 mA
C.
9 mA
D.
18 mA
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举一反三
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A.
This can affect your work.
B.
So how should you motivate yourself?
C.
However, this should not discourage you.
D.
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E.
They can change according to circumstances.
F.
Motivation is what you need most to do a good job.
G.
Without motivation you can neither set a goal nor reach it
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【判断题】第一次使用序列时,可以使用currval返回序列的当前值。
A.
正确
B.
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【单选题】在复数3+7i,0.-6i,3-2i,15中,是虚数的是
A.
1个
B.
2个
C.
3个
D.
4个
【单选题】关于急性肾盂肾炎的临床表现下列哪项是错误的
A.
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B.
尿频、尿痛、尿急
C.
大量蛋白尿
D.
有脓尿或血尿
E.
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A.
正确
B.
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【单选题】哪种油脂不属于适合做沙拉的低熔点油脂( )。
A.
椰子油
B.
橄榄油
C.
核桃油
D.
玉米油
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