下列哪种有害金属经甲基化后毒性增加() A.镉 B.汞 C.铅 D.砷 E.氟

题型:单项选择题 A1型题

问题:

下列哪种有害金属经甲基化后毒性增加()

A.镉

B.汞

C.铅

D.砷

E.氟

考点:职业卫生(医学高级)流行病学流行病学题库
题型:单项选择题 A1型题

Mr. Green is funny. He often tells us jokes and makes us _______.

[      ]

A. laugh

B. cry

C. to laugh

D. to cry

题型:单项选择题 A1型题

The Erie Canal was the first important national waterway built in the US. It crossed New York from Buffalo on Lake Erie Troy to Albany on the Hudson River. It joined the Great Lakes with the Atlantic Ocean. The canal served as a route over which industrial goods could flow into the west, and materials could pour into the east. The Erie Canal helped New York develop into the nation’s largest city.

The building of the canal was paid for entirely by the state of New York. It cost $ 7 143 789, but it soon gained its price many times over. Between 1825, when the canal was opened, and 1882, when toll charges were stopped, the state collected $121 461 891.

For a hundred years before the Erie was built, people had been talking about a canal which could join the Great Lakes and the Atlantic Ocean. The man who planned the Erie Canal and carried the plan through was De Witt Clinton. Those who were against the canal laughingly called it "Clinton’s Ditch". Clinton talked and wrote about the canal and drew up plans for it. He and Governor Morris went to Washington in 1812 to ask for help for the canal, but they were unsuccessful.

Clinton became governor of New York in 1817, and shortly afterwards, on July 4, 1817, broke ground for the canal in Rome, N. Y. The first part of the canal was completed in 1820. As the canal grew, towns along its course developed fast. The length of the canal is 363 miles.

We can see that the Erie Canal ().

A. joined the Great Lakes together

B. crossed New York from north to south

C. played an important part in developing New York City

D. was the first waterway built in the US

题型:单项选择题 A1型题

以下程序的输出结果是( )。
void main()

float a:
a=1/100000000;
printf("%g",a);

A.0.00000e+00
B.0.0
C.1.00000e-07
D.0

题型:单项选择题 A1型题

在有效申购总量经确认后,按以下()等办法配售新股。

A.当有效申购总量等于拟向二级市场投资者配售的总量时,按投资者的实际申购量配售

B.当有效申购总量小于拟向二级市场投资者配售的总量时,不再配售,直接宣布发行失败

C.当有效申购总量小于拟向二级市场投资者配售的总量时,按投资者实际申购量配售后,余额按照招股说明书或招股意向书所确定的方式处理

D.当有效申购总量大于拟向二级市场投资者配售的总量时,沪、深证券交易所按每1000股有效申购量配一个号的规则,对有效申购进行统一连续配号

题型:单项选择题 A1型题

CO2气体纯度快速测定仪的组成部分有()。

A.漏斗

B.CO2吸收器

C.通旋塞

D.气囊

E.量筒

更多题库