（） is a precaution which contributes to avoiding trouble under normal operating conditions.<br>A:Constant inspection<br>B:Keeping constant load<br>C:Remaining constant temperature<br>D:Varying speed

（） is a precaution which contributes to avoiding trouble under normal operating conditions.
A:Constant inspection
B:Keeping constant load
C:Remaining constant temperature
D:Varying speed

出自：海船船员证

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