单项选择题
A.0.4% B.0.5% C.0.6% D.0.3%
A.-10-30℃ B.不高于20℃ C.不低于20℃ D.大于25℃
A.80% B.85% C.90% D.95%
A.5 B.10 C.15 D.20
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