单项选择题
指针式石英手表的平均瞬时日差范围至少应满足()。
A.-0.5s/d~0.5s/d
B.-1.0s/d~1.0s/d
C.-1.5s/d~1.5s/d
D.-2.0s/d~2.0s/d
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单项选择题
A.-0.5s/d~0.5s/d
B.-1.0s/d~1.0s/d
C.-1.5s/d~1.5s/d
D.-2.0s/d~2.0s/d
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