已知x=3是方程ax-6=a+10的解,则a=( )
8
—Carry your __________ with you,your money,jewelry,camera and so on.
—OK.Thank you for reminding me.
A.valuables
B.suitcases
C.gifts
D.bags
双作用多级伸缩式液压缸,缩回时推力和速度是逐级变化的,结果是:().
A.推力和速度都增大
B.推力和速度都减小
C.推力增大,速度减小
D.推力减小,速度增大