...膛闭锁块(breech block)顶住弹壳底部闭锁的枪机,又可分为上涨式(rising block)、沉落式(falling block)、降下式(dropping block)、骨碌式(rolling block)、转一下式(turning block)、翻动式(turning block)、倾斜式(tilting block)几种 ..
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Dropping g block 下降式闭锁
The deficient tuyere with chop and change of temperature often causes block dropping.
风口暗淡不活，凉热变化无常，经常出现下大块。
They cap the igloo by dropping a keystone, or block with edges cut wider above than below, into the remaining gap in the roof, and "grout" the gaps between blocks of snow with additional snow.
人们用拱顶石来盖顶，或者把雪块削切得上边缘比下边缘更宽，放进剩下的屋顶缺口里，再用雪来塞满雪块间的缝隙。
As a kind of new type green material that saves energy, gas concrete block is apt to produce swelling, cracking or dropping. When it USES common mortar as plaster material.
加气混凝土砌块作为一种新型绿色节能材料，加气混凝土砌块砌体用普通砂浆抹面时易出现空鼓、裂缝甚至脱落现象。
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