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【单选题】
人体电阻简单情况下取( )考虑。A.
1-10Ω
B.
10-100Ω
C.
1kΩ-2kΩ
D.
10kΩ-20kΩ
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【单选题】In Canada, the Senate members are appointed from geographic regions while members of the House of Commons are elected by popular vote for a period not to exceed______ years.
A.
four
B.
five
C.
six
D.
seven
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A.
is going
B.
are going
C.
have been going
D.
has been going.
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A.
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B.
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C.
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D.
healed
【单选题】在正弦交流电路中,某负载的有功功率 P=1000W ,无功功率 Q=577var ,则该负载的功率因数为 ( )
A.
0.5
B.
0.577
C.
0.707
D.
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