颗粒污染物主要有()。
A.粉尘
B.雾尘
C.尘粒
D.灰尘
E.烟尘
参考答案:A, B, C, E
---- Putting on a happy face not only helps us make friends but also makes us feel better.
---- _______.
A.I’d love to
B.I’m with you on that
C.It’s up to you
D.It’s my pleasure
用户激活后,哪个地方可以查询当前用户激活的lP地址().
A、SGSN
B、GGSN
C、WAP网关
D、彩信中心