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【单选题】
将电阻的阻值分别为30欧姆,60欧姆,60欧姆,并联起来,其电阻值为A.
30欧姆
B.
150欧姆
C.
60欧姆
D.
15欧姆
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【简答题】若函数f（x）=sin（3-5x），则f′（x）=______．
【单选题】The rule by the Canadian court is called 'historic' mainly for______.
A.
the compensation for justices in damages
B.
the sum of money involved with awarding
C.
the profits being put before court's decision
D.
the concern about public health and trust
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A.
Free ticket.
B.
Free phone call.
C.
Cash reward
D.
Seat reservation.
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【单选题】依据《安全生产许可证条例》，民用爆破器材生产企业安全生产许可证的颁发机关是( )。
A.
国务院国防科技工业主管部门
B.
国务院安全生产监督管理部门
C.
省级人民政府安全生产监督管理部门
D.
省级人民政府公安部门
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