单项选择题
A.±1% B.±2% C.±3% D.±4%
A.1000t B.500t C.200t D.100t
A.0.5% B.1.00% C.1.50% D.2.00%
A.15.00%~20.00% B.20.00%~25.00% C.25.00%~41.00% D.≥41.00%
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