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【单选题】
一台三相电动机绕组星形连接,接到U L= 380 V的三相交流电源上,测得线电流I l =10A,则电动机每相绕组的阻抗为 ( )
A.
11Ω
B.
22Ω
C.
38Ω
D.
66Ω
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参考答案:
举一反三
【简答题】Even in the chaos of 1918, people who knew ______ and ______ did their duty, often in heroic fashion.
【判断题】通货紧缩是指社会一般物价水平持续下降长达3个季度以上。
A.
正确
B.
错误
【单选题】— Who will be _____ duty tomorrow? — Susan will. [     ]
A.
at
B.
on
C.
for
D.
in
【单选题】The highway policeman on duty ______ the driver who was speeding and asked to see his license.
A.
pulled up
B.
pulled in
C.
pulled out
D.
pulled off
【简答题】——Who is on duty today? ——
【单选题】Who was on duty yesterday? __
A.
I am
B.
I were
C.
I was
【单选题】'Who is _____ duty today?' 'I am.' [     ]
A.
on
B.
in
C.
at
D.
of
【单选题】–Who is on duty today? -- ____.
A.
Yes, I am
B.
No, it’s not me
C.
I am
【单选题】Who is on duty today? On duty 的反义词是:
A.
working
B.
off duty
C.
is responsible
D.
at work
【单选题】中国共产党党员是中国工人阶级的有( )觉悟的先锋战士。
A.
、社会主义
B.
、共产主义
C.
、政治思想
参考解析:
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