数据库系统的三级模式分别为 【5】 模式、内部级模式与外部级模式。

题型:填空题

问题:

数据库系统的三级模式分别为 【5】 模式、内部级模式与外部级模式。

考点:计算机等级考试C语言二级C语言笔试
题型:填空题

Most people have jobs. They go to work nearly every day. Some people are lucky, because they have very interesting jobs. Some people must take a long time to learn how to do their jobs. For example, to be a doctor, one should study for at least five years.

Some young people have very interesting and high-paying jobs. Many young athletes are very successful. Football and tennis players are usually under 35 years old, for older people can’t play these sports very well. They can’t move fast enough. Golf, however, is a good sport for older people. Many golf players are quite old, but they can still play golf very well.

Most people work until they are about 60 years old. Then they retire and have a lot of free time. Some people never retire. These people usually have interesting jobs. Writers, artists, scientists and actors usually work till they are very old.

根据短文内容,选择正确答案。

小题1:One should study for at least _________ years to be a doctor.

A.three

B.four

C.five

D.six小题2:Which sport can old people play?

A.Football.

B.Tennis.

C.Basketball.

D.Golf.小题3:What does the underlined word “retire” mean in Chinese?

A.锻炼

B.学习

C.退休

D.养老小题4:Which of the following is NOT true?

A.Some people have interesting jobs, but some don’t.

B.People usually stop working when they are about 60 years old.

C.Football and tennis players can work as long as they like.

D.According to the passage, writers, artists and doctors have interesting jobs.小题5:What is the passage mainly about?

A.Good jobs.

B.Interesting jobs.

C.Different jobs.

D.High-paying jobs.

题型:填空题

如图所示电路,以下说法正确的是

[ ]

A.只接通S2,灯亮且电铃响

B.只接通S1,灯亮且电铃响

C.只断开S3,灯亮且电铃响

D.只断开S1,灯亮且电铃响

题型:填空题

下列说法中错误的是

A.H3PO4的摩尔质量是98 g

B.1 L 1 mol·L-1的MgCl2溶液中,Cl的浓度为2 mol·L-1

C.若NA表示阿伏加德罗常数的值,则标准状况下11.2 L N2所含N原子数为NA

D.从3 mol·L-1的Na2SO4溶液中倒出5 mL溶液,Na的浓度为6 mol·L-1

题型:填空题

患者,男,70岁。小便点滴不通,短赤灼热,尿细如线,小腹胀满,口苦口粘,舌质红,苔黄腻,脉数。治疗应首选()

A.八正散

B.沉香散

C.春泽汤

D.清肺饮

E.石韦散

题型:填空题

CDMA车载卫星系统LNB的本振频率是()。

A.11250MHz

B.11300MHZ

C.11350MHz

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