船舶Δ=18764t,GM=0.187m,现存在初始横倾角θ0=2.14°,则船舶横倾角为20°时复原力矩减小()t²m。
A.708
B.643
C.613
D.507
参考答案:D
下图所示的化学实验基本操作中,错误的是
A.倾倒液体
B.熄灭酒精灯
C.量取液体
D.过滤
Frank _________work to do. [ ]
A. has many
B. has much
C. have a lot
D. have a lot of