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【单选题】
在三相半波可控整流电路中，当负载为电感性时，负载电感量越大，则()。A.
输出电压越高
B.
输出电压越低
C.
导通角θ越小
D.
导通角θ越大
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举一反三
【单选题】–Is your brother a worker or a doctor?. – ___________.
A.
doctor .
B.
Both.
C.
Yes , he is.
【简答题】已知函数 f(a)= ∫ a0 sinxdx， 则f（2013π）=______．
【单选题】设0≤x≤2π，则曲线y=sinx与x轴所围的面积为( )
A.
∫ 0 2π sinxdx
B.
｜∫ 0 2π sinxdx｜
C.
∫ 0 2π ｜sinx｜dx
D.
｜∫ 0 π sinxdx｜-｜∫ 0 2π sinxdx｜
【单选题】What will your doctor recommend you if your PSA test suggests a problem?
A.
You will have a blood test to measure your prostatic antigen.
B.
You doctor will arrange a digital rectal exam for you.
C.
your doctor will prescribe a prostate cancer screening.
D.
you will undergo a trans-rectal biopsy.
【简答题】If you are not able to attend your appointment with your doctor, or need to change it to a more convenient time, it is important that you let us know as soon as possible. This will enable us to offer ...
【简答题】求∫cos 2 x·sinxdx.
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