冰醋酸泄漏时，严禁用（）灭火。
A、水
B、泡沫
C、砂土
D、干粉
参考答案：A
If you have a job, ________ yourself to it and finally you'll succeed.[ ]
A. do devote
B. don't devote
C. devoting
D. not devoting
什么是3T1E原则？
