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【单选题】
一日光灯的额定功率 P=30W ,额定电压 U=220V ,接到频率 f=50HZ 的交流电源上,通过日光灯的电流是 0.41A ,则日光灯的功率因数为( )
A.
0.48
B.
0.33
C.
0.43
D.
0.44
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参考答案:
举一反三
【单选题】调度人员对车辆运行情况不需要实时掌握控制的是( )。
A.
货物的配载装运过程
B.
车辆按时发出
C.
车辆按时到达
D.
司机的生活起居
【单选题】离子电迁移率的单位可以表示成:
A.
m·s -1
B.
m·s -1 ·V -1
C.
m2·s -1 ·V -1
D.
s -1
【单选题】Mr. Rochester was mad with Jane, for she never answered when _____________.
A.
speaking
B.
spoken to
C.
spoken
D.
speaking to
【单选题】Who answered Mr. Briggs letter?
A.
Mr. Rochester.
B.
Mrs. Fairfax.
C.
John Rivers
D.
Mr. Mason
【单选题】I called Mr. Smith at his office this morning, but the voice______answered the phone was not his.
A.
which
B.
who
C.
as
D.
whom
【简答题】Who answered the phone?
【判断题】洞门的设置可以起到稳定洞口的边仰坡作用。
A.
正确
B.
错误
【单选题】选出对下列句子的重音和语调判断正确的选项 Who answered the question?
A.
'Who 'answered the ̗ question?
B.
Who 'answered the ̗ question?
C.
Who 'answered the `question?
D.
'Who 'answered the `question?
【单选题】离子电迁移率的单位可以表示成
A.
m·s -1
B.
m 2 ·s -1 · V -1
C.
m·s -1 · V -1
D.
s -1
【单选题】离子电迁移率的单位可表示成( )
A.
m·s -1
B.
m·s -1 · V -1
C.
m 2 ·s -1 · V -1
D.
s-1
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