晶体三极管和晶闸管都有三个电极,因此它们都是由2个PN结组成的。

题型:判断题

问题:

晶体三极管和晶闸管都有三个电极,因此它们都是由2个PN结组成的。

考点:船舶修造业考试船舶电工综合练习船舶电工综合练习题库
题型:判断题

根据拮抗作用的选择性,可将微生物间拮抗关系分为()关系。

A.偏利关系

B.寄生

C.非特异性拮抗

D.特异性拮抗

题型:判断题

阅读理解。

      Modern life is impossible without traveling. The fastest way to travel is by air. With a modern

plane you can travel in one day to places which took a month or more one hundred years ago.

     Traveling by train is slower than by air, but it has its advantages. You can see the country you

are traveling in. Modern trains have comfortable seats and dining cars. They make even the longest

journey enjoyable.

     Some people prefer to travel by sea when it is possible. There are large liners and river boats

with which you can visit many other countries and different places. Traveling by sea is a very pleasant

way to spend a holiday.

     Many people like to travel by car. You can make your own timetable. You can travel three or four

hundred miles or only fifty miles a day, just as you like .You can stop wherever you wish: where there

is something interesting to see, at a good restaurant where you can enjoy a good meal, or a hotel to

spend the night. That is why traveling by car is popular for pleasure trips, while people usually take

a train or a plane when they are traveling on business.

1. From the passage we know that the fastest way to travel is ______

A. by car    

B. by train    

C. by plane      

D. by boat

2. If we travel by car, we can____________     .

A. only stop at the destination              

B. make our own timetable

C. travel to a very far place in several minutes  

D. travel one thousand miles a day.

3. The best title of this passage is___________________  .

A. ways to travel        

B. travels    

C. transportation      

D. modern life

4. How many ways to travel are mentioned in the passage?

A. Five    

B. Six      

C. Three        

D. Four

题型:判断题

从铝土矿(主要成分是Al2O3,含SiO2、Fe2O3、MgO等杂质)中提取氧化铝的两种工艺流程如下

请回答下列问题:

(1)流程甲加入盐酸后生成Al3+的离子方程式为________________。

(2)流程乙加入烧碱后生成SiO32-的离子方程式为________________。

(3)验证滤液B含Fe3+,可取少量滤液并加入________________(填试剂名称)。

(4)滤液E、K中溶质的主要成分是________(填化学式),写出该溶质的一种用途________________。

(5)已知298 K时,Mg(OH)2的溶度积常数Ksp=5.6×10-12(mol/L)3。取适量的滤液B,加入一定量的烧碱至达到沉淀溶解平衡,测得pH=13.00,则此温度下残留在溶液中的 c(Mg2+)________。

题型:判断题

第二审人民法院审判只有被告人一方提出上诉的案件,在改判时,对被告人的刑罚()

A、民愤较大者可以加重

B、一律不得加重

C、应当根据实际情况加重或减轻

D、原判决量刑畸轻的可以加重

题型:判断题

ABC会计师事务所在审计G公司2010年度财务报表时,遇到如下问题,请代为作出正确的专业判断。

注册会计师在执行财务报表审计业务时,应当执行恰当的审计程序。以下所列程序中,每次审计均必须实施的有()。

A.了解被审计单位内部控制

B.控制测试

C.细节测试

D.实质性分析程序

更多题库