读等高线图，回答下列问题。
图中陡崖位于（）处（填字母），陡崖的相对高度最多不会超过（）米。
参考答案：C；800
You board an inflatable liferaft that has been hand launched from a sinking vessel. What should you do first after everyone is onboard the liferaft?（）.
A.Cut the painter
B.Operate the radio equipment
C.Open the equipment pack
D.Ventilate the liferaft of CO2
胃肠黏膜分泌过多液体引起的腹泻称为（）
A.动力性腹泻
B.吸收不良性腹泻
C.渗出性腹泻
D.渗透性腹泻
E.分泌性腹泻
