问题 问答题 简答题

为什么冬季作业时,注替管线要进行防冻堵检查且有冻堵时不得进行作业?

答案

参考答案:管线中有冰块,易造成压力升高导致管线爆裂,造成人员伤害及环境破坏。

阅读理解

阅读理解。

                                                    Foreign attacks on U.S.soil

       1812—During the War of 1812, British forces (军队) burned the new capital at Washington, D.C. They

also attacked Baltimore and New Orleans and captured (占领) Detroit, which at the time was a remote military

outpost (前哨基地). 

       1846—A brief invasion (入侵) by Mexican troops across the Rio Gande began the U.S. — Mexican War

in 1846. But the remaining action in that conflict (冲突) occurred in California, New Mexico and in Mexico.

California and New Mexico belonged to Mexico at the time. 

       1916—Mexican revolutionaries led by Pancho Villa attacked the town of Columbus, N.M., on March 9,

1916.

       1941—Japan attacked Pearl Harbor in Hawaii on Dec.7, 1941, killing nearly 2,400 people and forcing

America into World War II. 

       1993—Terrorists (恐怖主义者) blew up a truck bomb in the basement of the World Trade Center in

February 1993, killing six people and injuring more than 1,000. 

       2001—Terrorists hijacked (劫机) several planes on Sep.11, 2001. Two ploughed into (撞入) New

York's World Trade Center (WTC), toppling the two highest buildings in the city; a third seriously damaged

the Pentagon (五角大楼). The fourth hijacked plane crashed in Pennsylvania. Several thousand people were

killed in the attacks.  

1. During the War of 1812, British forces did the following except that _____.[ ]

A. they captured Detroit

B. they attacked Baltimore and New Orleans

C. they attacked the town of Columbus, N.M.

D. they burned the new capital at Washington, D.C.

2. During the September 11th terrorist attacks, _____.[ ]

A. terrorists hijacked three planes

B. destroyed the Pentagon completely

C. killed six people and injured more than 1,000

D. two planes knocked into New York's World Trade Center

3. The underlined word "toppling" in the last paragraph means _____.[ ]

A. reaching the highest point of

B. causing to fall

C. knocking into

D. building

4. How many foreign attacks mentioned in the passage did the US have? [ ]

A. 5

B. 6

C. 7

D. 8

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