单项选择题
If you came into contact with nitrobenzene while disconnecting the cargo hose，you should be aware that it is（）.
A.highly toxic when absorbed through the skin B.a blood poison C.a nerve poison D.All of the above
单项选择题 If a void occurs in the cargo hold，it is better to（）to control the broken stowage.
单项选择题 If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.
单项选择题 Hygroscopic cargoes should be ventilated when（）.
