The safety valve should be （） in the presence of C/E and Surveyor.<br>A:tightened up<br>B:sealed up<br>C:opened up<br>D:unscrewed

The safety valve should be （） in the presence of C/E and Surveyor.
A:tightened up
B:sealed up
C:opened up
D:unscrewed

出自：海船船员证

提示：
同一【IP】的非会员用户每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10252937】个 (题库试题定时更新)