测定环境水样中的氟首选的仪器分析方法是（）
A、GC
B、ISE
C、AAS
D、UV
参考答案：B
铁路危险货物罐式集装箱中修修程为5年。
He was in the mountain for a year. He felt as if he was ______from the outside world. [ ]
A. cut out
B. cut off
C. cut up
D. cut through
