Caulking waterproofing is the last defense line of the entire waterproofing measures in shield tunnel.
The terminal defense is the important component of the large area air defense, the last defense line of the large area air defense, and the significant measure of annihilating enemy s aerial warfare weapon and covering the important targets.
He believed that troops must be sent to occupy these lines of defense, first of all, the defense line of the mo.
Anchored on the Sea of Japan and Yellow Sea, these defense lines cannot be outflanked.
The Red Army officers have only a very general understanding of the location of the defense line and the condition of their fortification.
國文精選館
