第25题: [单项选择]The wooden plug inserted in the vent of a damaged tank of a ship should be removed in case it is decided to(). A. pump from the damaged tank B. fight a fire C. abandon the rig D. use the crossover system 参考答案:A
第26题: [多项选择]现场导淋开启困难的原因有()。 A. 密封面生锈 B. 阀杆螺纹锈蚀 C. 锁紧螺母松动 D. 填料失效 参考答案:A, B