单项选择题
A.0.05%~0.2% B.0.2%~0.4% C.0.4%~0.8% D.1%~2%
A.PAC141更大 B.PAC141更小 C.一样 D.PAC141无增黏作用
A.NH4-PAN B.CPAN C.Na-CMC D.NH4OH
A.钙 B.温 C.压 D.盐
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