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【单选题】
从一般机械设备电器修理质量标准方面判断,( )不属于外观质量A.
所有电器设备应外表清洁，安装稳固，易于拆卸、修理和调整
B.
所有电器设备、元件应按图纸要求配备齐全
C.
电线管应整齐
D.
机床电器设备应有可靠的接地线，其截面积应与截面积相同或不小于 4mm 2
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【简答题】常见的操作过电压有哪些？
【单选题】Atmosphere 1．The atmosphere is a mixture of several gases. There are about ten chemical elements which remain permanently in gaseous form. in the atmosphere under all natural conditions. Of these perm...
B.
Stratosphere
C.
Ionosphere
D.
The composition of the permanent gases in the atmosphere.
E.
The suspension of dust
F.
Tropophere Paragraph 2 ______
【简答题】常见的操作过电压有几种？
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【简答题】the atmosphere选择As_____________ as men leave the atmosphere [A] soon [B] well [C] much [D] possible
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