A:what’s your future plan
B:what your future plan is
C:what was your future plan
D:what your future plan was
若正数x,y满足x+3y=5xy,则3x+4y的最小值是( )
大约在六百年前,我国明代伟大的航海家郑和从南京开始了下西洋的壮举,当时他使用的是名叫“宝船”的大船,若宝船总重力为4.9×107牛,则船在长江水中航行时受到的浮力大小为____ 牛,浮力方向竖直向____,宝船进入大西洋中受到的浮力____(选填“变大”、“不变”或“变小”).
Jeff has a lot of ____ (meat) for lunch every day.