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【单选题】
电气设备在正常情况下不带电的金属部分与配电网中性点连接的系统是( )。A.
保护接地系统
B.
保护接零系统
C.
工作接地
D.
都不是
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【单选题】The youny man didn't know ______ to get married or to wait.
A.
whether
B.
weather
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if
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that
【单选题】A09118 装配A09.pdf 在SolidWorks中构建此装配体。 它包含2个轮子、2个连杆、1个连接块和1个底座。 轮子和底座的杆同轴心配合并与杆的端部平齐(无间隙) 。 连杆和轮子上的连接球重合。 连杆和连接块上的孔重合。 单位系统:MMGS(毫米、克、秒) 小数位数:2 装配体原点:任意 A=18.00 B=30.00 材料:6061合金;密度 = 0.0027 g/mm ^3 ...
A.
28.83
B.
27.98
C.
25.43
D.
27.83
【单选题】The old man didn't know ______
A.
where Io buy the stamp
B.
where to post the letter
C.
where m stick the stamp
【单选题】The man didn't know ________ the thief broke into the house and stole all his valuable things. [ ]
A.
it was when that
B.
when it was that
C.
that it was when
D.
was it when that
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【单选题】The youny man didn't know ______ to get married or to wait.
A.
whether
B.
weather
C.
if
D.
that