( )是重大危险源控制的重要内容。A.风险评价 B.安全预评价 C.安全评价 D.

题型:单项选择题

问题:

( )是重大危险源控制的重要内容。

A.风险评价

B.安全预评价

C.安全评价

D.重大危险源评价

考点:安全工程师安全生产管理知识安全生产管理知识
题型:单项选择题

下列有关实验取材、操作的叙述,正确的是[ ]

A.常选择质量浓度为0.3g/mL的葡萄糖溶液作为质壁分离的试剂

B.用标志重捕法调查土壤中蚯蚓的种群密度

C.用双缩脲试剂鉴定蛋白质时,为便于观察,选材时需回避有色材料,选用鸡蛋的蛋清部分

D.设计的小生态瓶,应该置于较强的散射光下,并定期补充营养物质

题型:单项选择题

虾青素(C40H52O4)是一种具有极强的抗肿瘤、抗氧化性的物质,可增强动物的免疫力.下列有关它的说法中,正确的是(  )

A.虾青素由96个原子构成

B.虾青素的相对分子质量是596

C.虾青素是一种氧化物

D.虾青素中碳、氢、氧元素的质量比为10:13:1

题型:单项选择题

把20克糖放入100克水中,糖和糖水的比是1:5______.

题型:单项选择题

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

题型:单项选择题

算法的基本特征是可行性、确定性、______和拥有足够的情报。

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