题目内容

Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.

A. be fitted with a positive fuel shut-off valve located at the tank
B. have a shut-off valve at the top of the tank
C. have a gate valve easily accessible in the space where the tank is located
D. have a drain cock at the lowest point in the fuel line

查看答案

搜索结果不匹配？点我反馈

更多问题

A. 又称为现况研究或现患率研究
B. 通常归于分析性研究范围内
C. 是在某一时点或在一个短暂时间内（如1天、1周或1月）对某一人群中有关疾病或临床事件的患病（或发生）状况及其影响因素进行调查分析
D. 研究设计相对严密，需要计算样本量

A. 葛底斯堡战役
B. 约克镇战役
C. 来克星顿之战
D. 萨拉托加战役