单项选择题
A.120° B.150° C.100° D.200°
A.10 B.6 C.3.5 D.8
A.±5% B.±10% C.±3% D.±4%
A.0.45%～0.55% B.0.15%～0.25% C.0.35%～0.40% D.0.25%～0.35%
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