Distance along a track line is measured on a Mercator chart by using the ().
A. latitude scale near the middle of the track line
B. longitude scale near the middle of the track line
C. latitude scale at the midlatitude of the chart
D. latitude or longitude scale at the middle of the scale
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广告行为具备了哪些构成要件,才能被认定为广告违法行为?
若有定义int a=9,b=6;则a
A. 0
B. 1
C. false
D. true
为什么交流发电机可以采用旋转磁场而直流发电机必须用旋转电枢?