【判断题】谨慎原则是指凡是可以预见的损失和费用均应予以确认,而对不确定的收入则不予确认。
【单选题】在未采取任何措施的前提下,下列哪种传染源的传染性最强?
【判断题】导游服务的内容是导游接待,导游服务的对象是游客。
【简答题】在链传动布置时,对于中心距较小,传动比较大的传动,应使 ( ) 边在上, ( ) 边在下,这主要是为了防止 ( ) 。而对于中心距较大,传动比较小的传动,应使紧边在 ( ) ,松边在 ( ) ,这主要是为了防止 ( ) 。
【单选题】Boeing has announced that as much as 50 percent of the primary structure - including the fuselage and wing - on the 787 will be made of composite materials. composite material means:
A.
the material is made of plastic
C.
the material is made of metal
D.
the material is made of stone
F.
None of the above is true