The injector pump is operated by a cam which drives the plunger （）.
A:top and bottom
B:to and fro
C:up and down
D:back and forth
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)