ZLD800型电动吊篮的额定速度不大于（）m/min。
A、2
B、12
C、8
参考答案：C
通过价格调整可以完全消除外汇风险。（）
In snall angle stability, when external forces exist , the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the（）.
A.center of gravity
B.center of flotation
C.metacenter
D.metacentric height
