When laneway is dug into coal bed with low venting quality and effusing of large quantity of gas, the digging velocity would be lowered and even effusing accidents may happen because of the difficulties in discharge of the gas.
在低透气性,且具有瓦斯突出危险煤层巷道的掘进过程中,由于瓦斯排放困难而影响掘进速度,且存在突出事故发生的危险。
参考来源 - 煤层深孔松动爆破聚能药管装药结构的设计研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Simultaneously, the safety air bag made of the fabric has good flexibility, low venting quality and high size stability.
同时该织物制成的安全气囊具有良好的柔软度，较低的通气度，高的尺寸稳定性。
Compared with the control, the vacuum package or adding deoxidant package with materials of low venting quality can constrain the accelerating speed of PV and AV, and delay rancidity.
采用低透气性的包装材料进行真空包装或添加脱氧剂包装，可明显抑制过氧化值和酸价的增加速度，延缓酸败。
High-quality buret have a venting-mechanism with which they can be very easily refilled with the exact volume for which the buret is calibrated.
高级的滴定管都有一种抽液功能使它们每次在滴定完毕时可以很精确地将滴定液加到精确的刻度。
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