单选题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 systemBindividual vacuum pumpsCa single non-condensing air ejectorDa two stage air ejector
单选题
A vacuum is initially established in the first and second stages of a low pressure evaporator by the use of （）
A
vacuum drag from the auxiliary condensate system
B
individual vacuum pumps
C
a single non-condensing air ejector
D
a two stage air ejector
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