A:3.7×10﹣5克
B:3.7×10﹣6克
C:37×10﹣7克
D:3.7×10﹣8克
单位换算:15m/s= ____ km/h,108km/h= ____ m/s.
—You'd better _______ the workers into two groups and ask them to take turns to work.
设Sn是等比数列{an}的前n项和,S4=5S2,则a3·a8a52的值为( )
关于右边概念图的叙述不正确的是( )