he sees people in trouble,he always gives them a hand.
A:Every time
B:The next time
C:The first time
D: The moment
一艘轮船自重4×107N,最大载货重量是1.5×108N,则这艘轮船的最大排水量是____ t,如果船在港口卸下6×107N的货物,则轮船所受浮力是____ N,它所排开水的体积减少____ m3。(设船在内河航行,g取10N/kg)
如图1是一张长方形的纸带,将这张纸带沿EF折叠成图2,再沿BF折叠成图3.