题干
—Nothing wrong with it, ______?
—No. Yours is a specially-built model. Drive carefully, though.
—No. Yours is a specially-built model. Drive carefully, though.
A：is there
B：does it
C：is it
D：has it
答案(点此获取答案解析）
A
，水的流速恒为V水，则船垂直岸的分速度为（ ）
有意义，那么x的取值为( )