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单选题
Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.
A
read/sufficient
B
consult/sufficiently
C
read/sufficiently
D
consult/sufficient
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单选题Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）A
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Run RIPrep.exe before installing the standard applications. C
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单选题What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?（）A
Repeat the message using any other channel on which you might attract attentionB
Key the microphone several times before transmitting againC
Turn up the volume on the receiver before transmitting againD
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