在下面列举的各个实例中,哪些情况机械能是守恒的?( )
不等式9>﹣3x的解集是____.
—____ you____ ____ ____ us?
“你想加入我们吗?”
一Yes.I'd____ ____
“是的,我想加入。”
I just finished ________my last movie yesterday.