【导读】
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1. [单选题]If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the
A. oil has a tendency to emulsify in the bowl
B. purifier will act as a clarifier at the discharge ring
C. oil will be lost through the water discharge ports
D. oil solids will be deposited only at the intermediate top disk
2. [单选题]集结在一起的艇筏可增大目标，还在于能：
A. 克服困难
B. 提高士气
C. 互相照应
