单项选择题
A.60 B.90 C.120 D.150
A.小于0.2% B.小于0.5% C.小于0.6% D.小于0.8%
A.20±2，＞90% B.20±3，＞90% C.20±2，＞95% D.20±3，＞95%
A.2.36 B.4.75 C.9.5 D.13.2
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