水泵开启后，发生泵体振动要检查（）是否松动，完善基础安装。
参考答案：底角螺丝
肥胖症的康复预防不包括下列哪一项（）.
A.少量饮啤酒
B.提高认识
C.良好的生活规律
D.加强运动
E.心情舒畅
Freeing ports on a vessel with soild bulwards（）.
A.prevent stress concentration in the bulwark
B.permit easy jettison of deck cargo in an emergency
C.provide opening through the bulwarks for mooring lines
D.allow water shipped on deck to flow off rapidly
