It will cause the paste oxidation and lose flux ratio balance if it is exposed for long - time 錫膏與空氣長(zhǎng)時(shí)間接觸后,會(huì)造成錫膏氧化、助焊劑比例成分失調(diào)。
We studied the factor that influence the quality of gaas , algaas and ingaas by mbe , and studied the growth temperature , growth time and the flux ratio of v - iii beam 研究了影響mbe生長(zhǎng)gaas 、 algaas和ingaas等單晶材料質(zhì)量的一些因素,對(duì)mbe生長(zhǎng)溫度、生長(zhǎng)時(shí)間和生長(zhǎng)時(shí)的-族束流比進(jìn)行了研究。
Many factors have effect on irrigation uniformity . with the growing of pressure , how is irrigation uniformity of trickle irrigation varying on different condition of the diameter of drip line , the distance of emitters , the length of drip line , the style of emitters , the flux ratio of emitters and the face gradient of little irrigation district . the consequence shows that pressure has puny effect on irrigation uniformity 滴灌系統(tǒng)的灌水均勻度受眾多因素的影響,本文通過(guò)毛管的管徑、滴頭間距、毛管的管長(zhǎng)、灌水器的類型和灌水器的流量系數(shù)不同的情況下,灌水均勻度隨壓力水頭變化模擬結(jié)果顯示,壓力水頭對(duì)灌水均勻度影響非常小。