用于声明所有变量是私有变量的命令是()
A.PRIV all
B.PUBLIC all
C.all=0
D.STORE 0 TO all
参考答案:A
---__________ will the match start?
---__________half past seven.
A.How long; until
B. How long; Not until
C.How soon; until
D.How soon; Not until
电气化铁道由电力机车和牵引供电系统两大部分组成。