波纹管密封的闸板阀
bellows sealed gate valve
不硬化的密封胶
nonhardening sealing compound
不正确的密封件安装
incorrect seal installation
密封的膨胀水箱
pressurized expansion tank
气密或水密封的
air-tightness or water-tightness
输出轴密封的安装
output shaft seal installation
塑胶密封的微电路
peak current ratingplastic encapsulated microcircuit
PECVDplastic encapsulated microcircuit
投标的密封和标志
sealing and marking of bid