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【单选题】
关于除尘器的效率,下述 ( ) 是错误的。A.
效率是指除尘器除下的粉尘与进入除尘器的粉尘质量之比
B.
分级效率是除尘器的重要性能指标之一
C.
对一定型号的除尘器，其分级效率是不变的
D.
除尘器的全效率与其分级效率和入口粉尘的粒径分布有关
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