安全阀类用于介质超压时的安全保护.Type valve for the media at the time of overpressure protection.但是,超压冲击波必然会穿透坚固的铠甲层.But the overpressure wave inevitably passes through the rigid armor layer.超压问题在高层建筑消防给水中客观存在,给消防给水系统带来损害.Overpressure i...
DESCRIPTION OF A NEW HYMENOPTEROUS PARASITE: SYMPIESIS PARNARE CHU ET LIAO SP . NOV. ( HYMENOPTERA t CHALCIDOIDEA: EULOPHIDAE )稻苞虫蛹寄生峰一新种—稻苞虫羽角姬小蜂SympiesisparnaraeChuetLiao ( 膜翅且:小蜂总科: 姬小蜂科 )One of the ways the parasite ...