and means for closing them  及其关闭设施

appliance for closing opening  关闭用具

automatic circuit closing for backup power  备用电源自动投入

closing arch in summer  夏季封拱

Closing for afforestation  封山育林

covering mechanisms for closing and unclosing  盖体开合机构

hill closing for forestation  封山育林

safe arch closing temperature  安全封拱温度

safety circuits for closing power switch  安全合闸电路

Air blasting gun for arch collapse  破拱空气炮

China Arch for New Millennium  中华世纪门

gemel arch grouting  封拱灌浆

HORIZONTAL JET GROUTING ARCH  水平旋喷拱棚

Advance small pipes for grouting  超前小导管

automatic recording system for grouting  灌浆自动记录仪

grouting for building rectification  注浆纠偏

grouting for water blocking  注浆堵水

Grouting for Water Sealing  注浆堵水

Grouting for Waterproof  注浆堵水