两位数乘8,积一定是三位数.______.(判断对错)
假设这个两位数是12,则12×8=96,积是两位数,
所以,两位数乘8,积一定是三位数.是错误的.
故答案为:×.
David apologized to me yesterday. __, I won't forgive him for it was not the first time that he had hurt me.
A.If so
B.If ever
C.Even so
D.Even though
下列选项中,对于分馏塔采用顶循环回流而不用冷回流,叙述错误的是()。
A、利于回收热量
B、减少塔顶冷却面积
C、减少塔顶至气压机入口压降
D、可以提高精馏作用