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【单选题】
电磁操动机构的操作电源( )。A.
必须是直流电源
B.
必须是交流电源
C.
既可以是直流电源也可以是交流电源
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A.
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B.
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C.
temporary personnel.
D.
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E.
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【简答题】Linux系统下的用户帐户分为两种:
【简答题】LINUX系统下的用户帐户分为两种：和。A. 普通用户帐户B. 超级用户账户
【简答题】Linux系统下的用户帐户分为两种：普通用户帐户和 帐户
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