当炉渣的颜色为紫色玻璃状,说明炉料中() A.含FeO太多 B.石灰石太多 C.含硫

题型:单项选择题

问题:

当炉渣的颜色为紫色玻璃状,说明炉料中()

A.含FeO太多

B.石灰石太多

C.含硫量高

考点:机械工程铸造工艺学铸造工艺学题库
题型:单项选择题

补肺气,治肺虚咳喘,宜选

A.益智仁

B.蛤蚧

C.冬虫夏草

D.巴戟天

E.胡桃肉

题型:单项选择题
已知某函数的导数为y′=
1
2(x-1)
,则这个函数可能是(  )
A.y=ln
1-x
B.y=ln
1
1-x
C.y=ln(1-x)D.y=ln
1
x-1
题型:单项选择题

在我国东部,北方地区特大城市多于南方地区的原因是[ ]

A、经济发展水平高  

B、气候条件优越  

C、平原面积广阔  

D、河流众多

题型:单项选择题
完形填空。
     Pulling heavy suitcases all day in the summer is hard work, _1_when you're a thin 14-year-old. That
was   2   in 1940-the youngest and smallest baggage boy at New York City's Pennsylvania Railway
Station.
     After just a few days on the job, I began  3   that the other fellows were overcharging passengers. I'd
like to  4   them, thinking, "Everyone else is doing it."
    When I got home that night, I told my dad  5  I wanted to do. "You give an   6  day's work," he said,
looking at me  7  in the eye. "They're    8    you. If they want to do that, you let them do that."
     I   9   my dad's advice for the rest of that summer and have lived by his words  10 .
     Of all the jobs I've had, it was my   11  at Pennsylvania. Railway Service that has   12   me. Now I
teach my   13   to have respect for other people and their   14 . Being a member of a team is a totally
  15  experience. If one person steals, it destroys  16   and hurts everyone. I can   17 many things, but
not with people who steal. If one of my players were caught stealing, he'd be   18 .
     Whether you're  19  a sports team, in an office   20  a member of a family, if you can't trust one
another, there's going to be trouble.
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