堆垛机提升链条检查周期是（）个月 A.1 B.2 C.3

哪项属于克罗恩病的肠外表现（）。

A.瘘管形成

B.腹泻

C.腹痛

D.腹腔内脓肿

E.杵状指

适合开通adsl业务的线路环阻指标应小于（）欧姆.绝缘电阻应大于10M欧姆.

— Are you a visitor here?

— That’s right. I ____ round the world and now my dream of coming to China ____ true.

A．have traveled；has come

B．was traveling had been come

C．am traveling；has come

D．have traveled；has been come

We are in        school.   [ ]

A. different              

B. same  

C. the same              

D. the different

宋代是我国都市饮食市场的形成和发展空前繁荣时期。 ( )