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【单选题】
中性点直接接地是指电力系统中( )中性点直接或阻抗与接地装置相连接。A.
只有1个
B.
至少1个
C.
必须两个以上
D.
必须全部
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反馈参考答案：
举一反三
【单选题】_______ my carelessness, the machine doesn’t work again. A. Due in B. Due to C. Due at D. Due of
A.
Due in
B.
Due to
C.
Due at
D.
Due of
【判断题】The leading cause of America’s entry into World War I is mainly due to the damage to America’s interests.
A.
正确
B.
错误
【单选题】Into the dark apartment _______, who was quite surprised when everyone shouted “Happy Birthday”.
A.
did David walk
B.
David walked
C.
David did walk
D.
walked David
【判断题】The leading cause of America's entry into World War I is mainly due to the damage to America's interests.
A.
正确
B.
错误
【单选题】Due to the entry and exit of firms in a monopolistically competitive market:
A.
economic profits and economic losses are dissipated in the long run.
B.
economic profits persist in the long run, but not economic losses.
C.
economic losses will exist in the long run, but not economic profits.
D.
both economic profits and economic losses exist in the long run.
【单选题】His health is improving day by day. It is quite ______ that the medicine has a good effect on his disease. [ ]
A.
strange
B.
apparent
C.
complex
D.
uncertain
【单选题】Some blood types are quite common, others are regionally , and still others are rare everywhere.
A.
distributed
B.
contributed
C.
obtained
D.
Convinced
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