复位装置是（）液压支架的特征装置。
A、支撑式
B、掩护式
C、支撑掩护式
D、放顶煤
参考答案：A
机体缺乏下列哪种维生素易导致坏血病（）
A.维生素A
B.维生素B
C.维生素C
D.泛酸
E.叶酸
Under the Carriage of Goods by Sea Act of 1936，a vessel will be liable for damage to a cargo when the damage arises out of（）.
A.delays due to seizure of the vessel
B.fire caused by fault of the carrier
C.strikes or lockouts
D.improper stowage
