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【单选题】
He is known to be , because he always thinks of himself instead of others.A.
helpful
B.
good-natured
C.
patient
D.
self-centred
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反馈参考答案：
举一反三
【简答题】射极输出器有何特点?有何用途?
【单选题】The government has taken some measures to solve the shortage of electricity, but it may be some time ________ the situation improves. [ ]
A.
since
B.
before
C.
unless
D.
when
【简答题】abdominal aorta 指( )
【单选题】对企事业单位的承包经营、承租经营的应纳税所得额是以每一纳税年度的收入总额，减除必要费用后的余额，该必要费用是（）元／月。
A.
1600
B.
3500
C.
4000
D.
4800
【单选题】The government has taken some measures to solve the shortage of electricity , but it may be some time _________the situation improves.
A.
since
B.
when
C.
before
D.
unless
【简答题】Coarctation of aorta (CoA)
【单选题】The government has taken some measures to solve the shortage of electricity, but it may be some time _________ the situation improves. [ ]
A.
since
B.
when
C.
unless
D.
before
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