【单选题】What happens when the elevation becomes very small and is lowering?
A.
The signal strength is at the maximum value.
B.
Communication may be degraded or impossible.
C.
The STEP TRACKING circuit is failure.
D.
The azimuth angle is at the minimum value.’
【单选题】反复测定样品中某物质的结果很接近于真值,说明所采用的测定方法: ( )
【单选题】What is the azimuth angle of the sun at sunrise during the equinoxes? (A)
【多选题】衡量公司行业竞争地位的主要指标是( )。
【判断题】BJ212编号中的“2”表示北京汽车制造厂生产的第二代产品。
【判断题】因经济增长率的变化而产生的国际收支不平衡,属于持久性失衡