单项选择题
The securing of passenger cars on a Ro-Ro vessel requires（）.
A.simple and lightweight equipment B.low labor intensive equipment C.specially designed equipment to avoid vehicle damage D.All of the above
单项选择题 The safety of the port should（）in respect of a vessel properly manned and equipped，and navigated and handled without negligence and in accordance with good seamanship.
单项选择题 The primary danger in helicopter fires is（）.
单项选择题 The premium is usually included in（）.
