人体能量平衡是健康的基础，能量消耗包括基础代谢、体力活动和食物热效应

基础代谢率的含义是（）

A.静卧、清醒而禁食4h能量消耗

B.静卧、放松而清醒时能量消耗

C.静卧、放松而熟睡时能量消耗

D.处于基础代谢状态下，每小时每平方米体表面积的能量消耗

E.人体处于恒温条件下，平静呼吸时的能量消耗

Reserve buoyancy is（）.

A.also called GM

B.the void portion of the ship below the waterline which is enclosed and watertight

C.affected by the number of transverse watertight bulkheads

D.the watertight portion of a vessel above the waterline