磺胺类药抗菌作用的机制是()。 A.阻碍细菌细胞壁的合成 B.改变胞浆膜渗透性,引起

题型:单项选择题 B型题

问题:

磺胺类药抗菌作用的机制是()。

A.阻碍细菌细胞壁的合成

B.改变胞浆膜渗透性,引起细菌直接溶解

C.直接干扰细菌核酸的合成

D.通过抑制叶酸合成间接影响细菌细胞的核酸合成

E.阻碍细菌蛋白质的合成

考点:骨外科学主治医师骨外科基础知识主治医师骨外科学基础知识真题
题型:单项选择题 B型题

工程建设项目风险按潜在损失形态分类,不包括( )

A.发包人风险
B.工程财产损失险
C.第三者责任风险
D.人身意外伤害险

题型:单项选择题 B型题

根据《建设工程工程量清单计价规范》(GB 50500-2008)规定,有关墙、柱面工程工程量计算,说法正确的有( )。

A.柱面抹灰按设计图示柱断面周长乘以高度以面积计算

B.柱面镶贴块料按设计图示尺寸以实贴面积计算

C.墙饰面按设计图示墙外围尺寸乘以净高以面积计算

D.隔断按设计图示框外围尺寸以面积计算

E.柱(粱)饰面按设计图示饰面外围尺寸以相应面积计算

题型:单项选择题 B型题

下列各种“爆炸”中,其中有一种变化不同于另外三种变化的是          

A.夏天,自行车胎内气太足而引起爆炸

B.炸药爆炸

C.烧锅炉时,水蒸气排出不畅而引起爆炸

D.气球升入高空后爆炸

题型:单项选择题 B型题

阅读理解。

    In the current economic downturn, many American schools are adding a new

Subject: financial literacy (理财). One program in Virginia even gets students out of

the classroom for a day to learn how far their money will go in the real world.  What

looks like a shopping mall is actually an educational field trip experience for a group of

young people.

    Finance Park is a special place where students apply what they have been taught in

class about money management.  The facility (设施) opened last year in Fairfax,

Virginia.  It is the fifteenth Finance Park built in the last decade by Junior Achievement

USA, a non-profit organization helping to prepare young people for financial success.

"Since the financial crisis (危机), the demand for Finance Parks around the country

has grown," says Ed Grenier, president of the Washington, DC chapter.

    Financial literacy has only recently become part of the regular subjects in Fairfax

County. "Some students, some teachers, some schools did it, but now it is much

more systematic," Reilly says, "and it can ensure that all students get this background

information." That is why every eighth grade student in Fairfax County will eventually

spend a day here.

    Thirteen-year-old Sam says she has learned an important life lesson. "I didn't know

how expensive everything would be." Anthony, also 13,is looking forward to telling

his parents what he learned."I'11 probably tell them I want to stay a kid a little longer

and take my time to become an adult." This isn't the end of financial studies for

Anthony and the other students here.  Virginia is one of 23 states which requires

students to take a financial education class in high school in order to graduate.

1. The purpose of opening financial literacy is to _____.  

A.  help students learn how to make money

B.  tell students what the financial crisis is

C.  change the current economic downturn

D.  prepare young people for financial success

2.   From the text we know that Finance Park is _____.    

A.  an actual shopping mall

B.  a profit-making organization

C.  an educational field trip experience for students

D.  a special place for students to spend money freely                  

3.  We can infer from the text that _____.    

A.  financial literacy will be popular all over America

B.  but for the financial crisis Finanle Park wouldn't have been opened

C.  students can graduate after taking a financial literacy class in Finance Park

D.  students are interested in Finance Park and have the benefit of it

题型:单项选择题 B型题
如图为理想变压器原线圈所接交流电压的波形.原、副线圈匝数比n1:n2=10:1,串联在原线圈电路中电流表的示数为1A,下列说法正确的是(  )

A.变压器输出端所接电压表的示数为20V

B.变压器的输出功率为200W

C.变压器输出端的交流电的频率为50Hz

D.穿过变压器铁芯的磁通量变化率的最大值为20/n2Wb/s

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