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问题
解答题
一袋土豆，吃了它的
3
5
，吃了30千克，这袋土豆原有（ ）千克．
A．20
B．50
C．18
答案
30
÷
3
5
=30×
5
3
=50（千克）；
答：这袋土豆原有50千克．
故选：B．
选择题
He doesn’t visit Mr. Black___.
A．as many as he used to
B．as many as he was used to
C．as much as he used to
D．as much as he was used to
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问答题 简答题
简述熔质原子在位错附近的分布
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