采场移动高压电缆，操作规程规定（）。A、操作人员穿绝缘鞋，戴绝缘手套，用手拖电缆 B、

泥浆护壁钻孔法

Footracing(竞走)is a popular activity in the United States．It is not only seen as a competitive sport，but also as a way to exercise，and to donate(捐赠)money to a good cause．Though serious runners may spend months training to compete，other runners and walkers might not train at a11．Those not competing to win might run in an effort to beat their own time，or simply to enjoy the fun and exercise．People of all ages, from those less than one year old to those in their 80s, enter into this sport．The races are held on city streets，on college campuses，through parks，and in suburban areas，and commonly 5 to 1 0 kilometers in length．

The largest footrace in the world is the 1 2-kilometer Bay to Breakers race that is held in San Francisco every spring．This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean．In 1 993 there were 80，000 people running in this race through the streets and hills of San Francisco．In the front are the serious runners who compete to win，and who might finish in as little as 34 minutes．Behind them are the thousands who take several hours to finish．In the back of the race are those who wear costumes just for fun．In 1 993 there was a group of men all of whom dressed up like Elvis Priestly．There was a group of firefighters who were all tied in a long line and were carrying a fire—hose(水龙带)．One year there was a wedding party in which the bride dressed in a long white gown(长袍)and the groom wore a tuxedo(晚礼服)．They threw flowers to by-standers，and were actually married at some point along the route．

小题1:The main purpose of this text is to__________．

A．describe a popular activity

B．encourage people to exercise

C．make fun of runners in costume

D．give reasons for the popularity of footraces小题2:Which of the following is implied by the author?

A．Walkers don’t compete for prizes．

B．Footraces appeal to a variety of people．

C．Entering a race is a way to make friends．

D．Running is a good way to strengthen the heart．小题3:The underlined words “to a good cause” in the first paragraph could best be replaced by ___________.

A．for a good reason

B．to support a sound principle

C．for a good purpose

D．to protect an excellent player

鼻咽位于_________下方，前方正中为_________后缘，两侧为_________，后面平对第_________颈椎。

如图是用模型宋表示物质间发生的化学反应．图中●和○分别表示两种不同元素的原子则该模型所表示的反应类型属于（　　）

A．化合反应

B．分解反应

C．置换反应

D．复分解反应

高处作业的每道工序必须指定施工负责人，并在施工前必须由本工序负责人向施工人员进行（），明确分工。严禁任何违章作业的现象发生。

A.技术和安全交底

B.技术交底

C.安全交底

D.安全培训和教育