氧气表各部分的作用，叙述错误的是()。A．安全阀：使过多氧气由四周小孔流出 B．流量

未来发生的交易或者事项形成的义务，属于现时义务，应当确认为负债。( )

—__   _, sir?

—Yes, we’ll have tomato soup, roast beef and potatoes．

A．What would you buy

B．What can I do for you

C．Do you enjoy your meal

D．Ready to order now

主机机头有多少个手柄，各有什么作用？

Xu Beihong is most known________drawing horses________an artist.[      ]

A. for; as  

B. as; for

C. to; for  

D. to; as

IMS紧急呼叫中根据路由配置策略，（）将呼叫路由到紧急呼叫中心。

A.SCSCF

B.ICSCF

C.PCSCF

D.AS