单项选择题
A.±1%~5% B.±10%~20% C.±5%~10%
A.0.001 B.0.1 C.0.03 D.0.003
A.3.5 B.4.5 C.8 D.2.75
A.5000t/a B.10000t/a C.20000t/a
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