A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port. ["monkey","donkey","waste heat","mai"]
什么是冷弯半径？
Cargo damaged due to water being present in a cargo hold，as a result of a leak in the hull plating，is said to be damage by（）. ① Free moisture ② Transfer of hygroscopic moisture ["① only","② only","Both ① and ②","Neither ① nor ②"]
在《危险货物分类和品名编号》（GB6944-2005）中，将危险化学品（货物）分为哪九个类别？
救护队一般由医生、管事或大副担任队长。
“OK”手势和竖大拇指的手势在国外都有哪些含义？
