《动车组列车服务质量规范》中，采用广播、视频、图形标志、服务指南等方式，宣传()和车辆设备设施的使用方法，提示旅客遵守安全乘车规定。
A. 乘车须知
B. 旅行须知
C. 安全常识
D. 旅行常识
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Which is an advantage of using watertight longitudinal divisions in double bottom tanks ().
A. Cuts down free surface effect
B. Increases the rolling period
C. Decreases weight because extra stiffeners are unneeded
D. Lowers the center of buoyancy without decreasing GM
对炭疸芽孢无效的消毒药是()
A. 含氯石灰
B. 过氧乙酸
C. 苯扎溴铵
D. 溴氯海因
E. 氢氧化钠
船舶保安记录在船上：
A. 只能用电子格式保存
B. 只能保存一个航次
C. AB都对
D. AB都错
Index error of a sextant is primarily caused by ().
A. Improperly correcting the other errors in a sextant
B. The horizon glass not being parallel to the horizon mirror
C. The horizon glass not being parallel to the index mirror
D. Human error in taking a celestial observation
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