【判断题】若刚体上作用的三个力作用线在同一个平面内,且作用线交于一点,则此三个力一定处于平衡状态。这一说法
【多选题】作用于刚体上三个相互平衡的力,若共中两个力的作用线汇交于一点,则此三力必在同一(),且第三个力的作用线通过()。
【多选题】In China, visa is classified into several categories, they are( )
【单选题】下列哪一项不是肾综合征出血热的主要临床表现( )。
D.
发热伴面、颈和上胸部潮红,眼结膜、咽部充血潮红
【单选题】I was not at all happy at the prospect of the 700-mile drive from Dar es Salaam to Nairobi. It was not that I disliked driving but I suspected that what is a very pleasant trip in the dry season could...
D.
having to drive through black cotton soil
【判断题】若刚体上作用的三个力作用线在同一个平面内,且作用线交于一点,则此三个力一定处于平衡状态。