630里有______个7,有______个9.
630÷7=90(个),
630÷9=70(个).
即630里有 90个7,有 70个9.
故答案为:90,70.
What did you do _____ your day off?[ ]
A. on
B. in
C. by
D. at
场(厂)内专用机动车辆大致分为两类,一类以内燃机作为动力,一类以电动机作为动力