单项选择题
A.≥5 B.≤4 C.≥8 D.以上均不是
A.±0.05% B.±0.1% C.±1% D.±2%
A.等于 B.大于 C.小于
A.2a+50mm B.5a+50mm C.5a+100mm D.5a+150mm
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