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【单选题】
当变压器采用比率制动特性的差动保护时，变压器无电源侧的电流互感器（）接入制动线圈。A.
必须
B.
可以
C.
不应
D.
无要求
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反馈参考答案：
举一反三
【单选题】Who checks the bridge clock for accuracy each day?
A.
Third Officer.
B.
Second Officer.
C.
Chief Officer.
D.
Assistant Officer.
【单选题】Who checks the bridge clock for accuracy each day?( )。
A.
third officer
B.
second officer
C.
chief officer
D.
assistant officer
【单选题】【单选】Who checks the bridge clock for accuracy each day?
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assistant officer
【单选题】Who checks the bridge clock for accuracy each day（）.
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assistant officer
【简答题】IEEE 802.11b定义了使用跳频扩频技术的无线局域网标准，它的最高传输速率可以达到【 】Mbps。
【单选题】[9-4]Who checks the bridge clock for accuracy each day ___.
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assistant officer
【简答题】IEEE 802.11b定义了使用跳频扩频技术的无线局域网标准，它的最高传输速率可以达到11Mbps。802.11a将传输速率提高到______Mbps。
【单选题】11b定义了使用跳频扩频技术的无线局域网标准，传输速率为1mbps，2mbps，5.5mbps( )。
A.
10mbps
B.
11mbps
C.
20mbps
D.
54mbps
【单选题】Who checks the bridge clock for accuracy each day?（）.
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assist nt officer
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