风扇皮带有打滑的声音时,如检查皮带张力正常,可在皮带两边涂抹皮带蜡。
效果确认的先决条件() ["数据必须正确","查检表持续收集数据","配合所下对策逐一检讨,亦既要层别确认","对策是否有副作用,必须同时考虑利多或弊多?是否有更好的对策?"]
下列属于电子合同的相关技术有()。 ["ASP","DDS","EDI","VPN"]
His parents no longer worry about him. He has a good job and can live()his own now. ["at","by","on","with"]
以下不符合人工授精管理的是()。 ["从持有卫生部批准证书的人类精子库获得精源","签定《知情同意书》及《多胎妊娠减胎术同意书》","同一位供精者的冷冻精液最多只能使5名妇女受孕","任意查阅供受精者双方的档案"]
《简氏防务周刊》是著名的军事刊物,请问它是哪一年创刊的?