【多选题】平面任意力系向其作用面内任一点简化,一般可以得到( )。
【多选题】The following statements about Americans are :
A.
Most Americans put great faith in the future.
B.
Most Americans are constantly planning for the future.
C.
Many of them can hardly wait to finish what they are doing so that they can move on to something else.
D.
What they want, they want now, so they can dispose of this moment and move on to the next.
【多选题】平面任意力系向其作用面内任一点简化,一般可以得到( )。
【单选题】Today there are about seven ______ Americans in colleges and universities
【简答题】平面任意力系向作用面内一点简化,根据力的平移定理,可以得到一个平面汇交力系和一个 。
【判断题】自耦变压器的公共部分断开时,原边高电压会引入低压边,造成危险,因此,自耦变压器变压比不宜过大,一般应小于2.5。
【单选题】对渗出液的叙述正确的是() ①蛋白含量高 ②细胞数多 ③相对密度低 ④容易自凝 ⑤Rivalta试验阴性