-- ______ our eco-travel plan might be put off.
-- Yes, it all depends on the weather.
A:I've been told
B:I've told
C:I'm told
D:I told
能使两个直角三角形全等的条件是( )
给多音字组词
看kàn____ kān____ 重 zhòng____ chóng ____
假jiǎ____ jià____
如图所示,物体在恒定拉力F的作用下沿水平面做匀速直线运动,运动速度为v,拉力F斜向上与水平面夹角为θ,则拉力F的功率可以表示为( )