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【多选题】
保护接地和保护接零的使用范围为 。A.
在中性点不接地系统中用电设备的外壳应采用保护接地
B.
在中性点接地系统中用电设备的外壳应采用保护接零
C.
在同一个低压供电系统中，不允许保护接地和保护接零同时使用
D.
由低压公用电网或农村集体电网供电的电气装置应采用保护接地，不得采用保护接零
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反馈参考答案：
举一反三
【单选题】有数据定义BUF DB 8 DUP(3 DUP(2),2 DUP(3)),在BUF中能构成数据0302H有( )。
A.
5个
B.
6个
C.
7个
D.
8个
E.
Y
【多选题】Please choose the right forms for dates.
A.
23 September, 2005
B.
23rd September, 2005
C.
May 7, 2006
D.
2006, May 7th
【单选题】II. Choose the correct answers. Few people are able to of the future but we can imagine it.
A.
make a use
B.
make a decision
C.
make a promise
D.
make prediction
【单选题】Please choose the right description about language of four.
A.
The Language of Four is to divide the world.
B.
The Language of Four is to provide the sense of whole.
C.
The Language of Four is to list, compile and expand.
D.
The Language of Four is to denote the single-mindedness.
【简答题】I was (please) ______ to have received your letter dated May 20th last month.
【单选题】Please choose the right answers.
A.
surely i will
B.
yes, please do
C.
it was my pleasure
D.
thanks,but i have to go
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