If the pilot flies the plane in a clockwise circle, what does this mean?
A:It means "message not received”.
B:It means "message received and understood”.
C:It means "message received but not understood”.
D:It's not mentioned in the passage.
阳光下,太阳能热水器按( )的方式摆放,升温比较快。
钟表上2时15分,时针与分针的夹角是( )
小车重200N,人用30N的水平力推小车沿水平路面匀速前进50m的过程中,下列判断正确的是( )