When using horizontal sextant angles of three objects to fix your position,an indeterminate position will result in which situation().
A. The objects lie in a straight line
B. The vessel is inside of a triangle formed by the objects
C. The vessel is outside of a triangle formed by the objects
D. A circle will pass through your position and the three object
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交流电变化的快慢一般可用()来衡量。
A. 频率和初相
B. 周期和有效值
C. 角频率和初极
D. 频率周期或角频率
交易营销认为价格不是主要的竞争手段。
A. 正确
B. 错误
青贮饲料之所以被人们所重视,能够大量保存()是其重要原因。
卫生部制定《医疗机构临床实验室管理办法》根据哪些法律、法规?