油量为2500kg及以上的室外110kV变压器之间，如果无防火墙，则防火距离应不小于

小题1: What is necessary to know when we speak English besides using grammar?

A．Introduction.

B．The culture.

C．Grammar.

D．Topics.小题2: "When speaking to a stranger, ask them where they are from and then make a connection (联系) with that place" can be used as a sentence to_______.

A．speak about location

B．talk about sports

C．address people

D．talk about work小题3: We can learn from the text that_______.

A．Americans shake hands when greeting same sex friends

B．different sex friends should hold hands when first meeting

C．when you speak to others, it's polite to look into their eyes

D．smoking is not allowed in the modem United Sates小题4: What would be the best title for the text?

A．American English Tips.

B．Language Differences.

C．The Different Language Culture.

D．American Customs.

患者，女，左上65右上67缺失，可摘局部义齿修复，左上75右上58为基牙，右上8近中、颊向倾斜，该牙设置环形卡环。

弯制环形卡环时，常用的钢丝是 （）

A.22号钢丝

B.19或20号钢丝

C.17号钢丝

D.21号钢丝

E.18号钢丝

结构钢材采用的平炉钢或氧气转炉钢有何区别？

针麻具有以下优点（）

A.安全、简便、经济、易学

B.无麻醉药干扰生理功能

C.术中病人清醒，可主动配合

D.针刺有调整生理功能功效，副反应轻

E.针麻后效应有利于病人康复

齿轮泵的缺点是存在单向径向力，部分机件容易磨损、流量（）。