果园里种了34棵桃树,种的梨树是桃树的8倍,种的梨树和桃树一共有多少棵?
34+34×8
=34+272,
=306(棵).
答:种的梨树和桃树一共有306棵.
It____be the postman at the door. It's only six o'clock. [ ]
A. mustn't
B. can't
C. won't
D. needn't
13型车钩裂纹焊修应由裂纹处起弧焊修,不允许在钩体非焊补表面引弧,整个坡口须连续()焊完,焊坡与金属交接处应缓坡过渡,电焊条施焊速度应控制在150~250mm/min范围内。
A.一次
B.两次
C.三次