下列认识或做法正确的是( )
A:在煤炉上放一壶水就能防止一氧化碳中毒
B:对于人体必需的元素摄入量越多越好
C:用铁制容器放波尔多液(含硫酸铜)
D:用白醋除热水瓶胆内的水垢
点通过矩阵M1=10012和M2=10013的变换效果相当于另一变换是( )
—I'll go to America for a trip nex t week.
—Great!
Not until we saw the manager did we know that the bank ________the company for the purpose of reducing its borrowings.
I am busy ________ English in my room.