完成下列核衰变方程,并在横线上注明属于哪类衰变。
(1)+( )___________;
(2)+( )___________。
(1),β衰变
(2),α衰变
管式换热器换热管结垢可通过()来清除。
A、蒸汽吹扫
B、高压射流清洗
C、水冲洗
D、木锤敲击
It is said in Australia there is more land than the government knows ______.
[ ]
A. it what to do with
B. what to do it with
C. what to do with it
D. to do what with it