单选题In modern installations, the main engine and the standby auxiliary engines（）Acan be started at low temperature and are free from preheatingBusually are preheated by steam before being startedCare kept at a constant temperature and free from preheatingDare kept at a low temperature to save energy
单选题
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
参考解析
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