In most countries, the metric system has been _____ for all measurement.
A. admitted
B. adapted
C. applied
D. adopted
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用经校正的万分之一分析天平称取0.1克试样,其相对误差为()
A. ±0.1%
B. +0.1%
C. -0.1%
D. -0.1%
按内容性质分类,广播电视节目可分为新闻性节目、教育性节目、()和服务性节目
A. 谈话性节目
B. 文艺性节目
C. 广告性节目
D. 知识性节目
The little girl is ignorant _____ the basic rules of English grammar
A. for
B. of
C. with
D. against
负载的有功功率为P,无功功率为Q,电压为U,电流为i,确定电抗X大小的关系式是()
A. X=Q/Ⅰ 2
B. X=Q/Ⅰ
C. X=Q2/Ⅰ 2
D. X=UⅠ2/ Q