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【单选题】
中性点直接接地系统中，零序电流的分布主要取决于( )。A.
发电机是否接地
B.
变压器中性点接地的数目
C.
用电设备的外壳是否接地
D.
故障电流
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When his daughter Mary went out for her evening walk Doctor Cochran sat for an hour alone m his office. It began to grow dark and the man who all afternoon had been sitting on chairs and boxes before ...
A.
had intended to go for a walk with Mary
B.
had to fight with acute depression
C.
liked to grow his beard in purpose
D.
was suffering from a fatal disease
【单选题】Mary sat at the table, looked at the glare and ______ her lips.
A.
smacked
B.
opened
C.
parted
D.
separated
【简答题】雕刻的艺术表现形式有 ( )、( )。
【单选题】Mary sat at that table, looked at the plate and _________ her lips.
A.
smacked
B.
opened
C.
parted
D.
separated
【单选题】Mary sat at the table, looked at the plate and ______her lips.
A.
smacked
B.
opened
C.
parted
D.
seperated
【简答题】Mary sat on the sofa, (watch) TV.
【单选题】When I entered the room, I found Mary ______ at the desk ______ her homework.
A.
sat; doing
B.
sitting; to do
C.
seating; to do
D.
seated; doing
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