薛志俊在焦煤集团二届五次职代会上作了“统一思想，提高认识，，为实现焦煤安全发展目标提供坚强保证”的报告.
查看答案
Reserve buoyancy is the（）.
A. unoccupied space below the waterline
B. volume of intact space above the waterline
C. excess of the buoyant force over the gravity force
D. difference in the buoyant force in salt and fresh water
微信支付 
支付宝支付