A vacuum is initially established in the first and second stages of a low pressure evaporator by the use of （）
- Avacuum drag from the auxiliary condensate system
- Bindividual vacuum pumps
- Ca single non-condensing air ejector
- Da two stage air ejector
问题
A vacuum is initially established in t
参考解析：
分类：船舶电气与船舶安全题库
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