In modern installations, the main engine and the standby auxiliary engines（）<br>A:can be started at low temperature and are free from preheating<br>B:usually are preheated by steam before being started<br>C:are kept at a constant temperature and free from preheating<br>D:are kept at a low temperature to save energy

In modern installations, the main engine and the standby auxiliary engines（）
A:can be started at low temperature and are free from preheating
B:usually are preheated by steam before being started
C:are kept at a constant temperature and free from preheating
D:are kept at a low temperature to save energy

出自：海船船员证

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