单项选择题
A.3B.4C.5D.6
A.50B.100C.150D.200
A.0.3%;0.15%;0.25%;0.15%B.0.25%;0.15%;0.2%;0.1%C.0.3%;0.15%;0.2%;0.1%D.0.3%;0.15%;0.3%;0.15%
A.80%;2.5mmB.75%;2mmC.90%;2mmD.60%;3mm
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