在VRP平台上,如果想要让ping程序以指定的IP作为回显请求报文的源地址,可以使用下面哪一个参数().
A.-a
B.-s
C.-d
D.-n
参考答案:A
---Tom has failed again in the math exam. I am really let down.
---______ He has already done his best.
A.Don’t push him.
B.No kidding.
C.He should be to blame.
D.No wonder.
精密过滤器主要用来去除冷凝液中的()。
A、阴阳离子
B、杂质和大部分铁
C、阳离子和铁
D、阴离子和杂质