扑救B类火灾应选用( )。
A.干粉灭火器
B.水型灭火器
C.卤代烷灭火器
D.二氧化碳型灭火
E.泡沫灭火器
参考答案:A,C,D,E
当x∈(1,2)时,不等式x-1<logax恒成立,求a的取值范围.
The newly-elected president is determined to______the established policy of de veloping agriculture.
A. go for B. go on C. go by D. go up