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【单选题】
如果矩阵【图片】满足AB=BA，则m,n,s,t应满足的条件为__________A.
n=t
B.
m=s
C.
m=n=s=t
D.
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反馈参考答案：
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【简答题】溴化锂溶液液面上蒸气总压力 水蒸气的压力,同温度水的饱和蒸气压力,溶液中产生的水蒸气总是处于 状态。
【单选题】In the 16th and 17th century, poor people would be punished more seriously __.
A.
because they were thought to be more likely to commit a crime
B.
because the rich people hate them
C.
because the law was not made by the poor people
D.
because their crimes were more seriously
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