What is the calling and distress frequency

题型:单项选择题

问题:

What is the calling and distress frequency on a single side band (SSB) marine radiotelephone?()

A.1492 kHz

B.1892 kHz

C.2082 kHz

D.2182 kHz

考点:航海英语遇险通信遇险通信题库
题型:单项选择题

下列SQL语句中,包含了不正确定义语句的组是( )。 Ⅰ.CREATE TABLE...CREATE VIEW...CREATE INDEX... Ⅱ.DROP TABLE...DROP VIEW...DROP INDEX... Ⅲ.ALTER TABLE...ALTER VIEW...ALTER INDEX...

A.只有Ⅰ

B.只有Ⅱ

C.只有Ⅲ

D.Ⅰ和Ⅱ 下面两题基于学生.课程数据库中的三个基本表: 学生信息表:s(snumber,sname,sex,age,dept)主码为snumber 课程信息表:c(cnumber,cname,teacher)主码为cnumber 学生选课信息表:sc(snumber,cnurnber,grade)主码为(snumber,cnumber)

题型:单项选择题

There was once a lonely girl who longed so much for love.One day while she was walking in the woods she found two starving songbirds.She took them home and put them in a small cage,caring them with love.Luckily,the birds grew strong little by little.Every morning they greeted her with a wonderful song.The girl felt great love for the birds.

One day the girl left the door to the cage open accidentally.The larger and stronger of the two birds flew from the cage.The girl was so frightened that he would fly away so as he flew close,she grasped him wildly.Her heart felt glad at her success in capturing him.Suddenly,she felt the bird go limp,so she opened her hand and stared in horror at the dead bird.It was her desperate love that had killed him.

She noticed the other bird moving back and forth on the edge of the cage.She could feel his strong desire-needing to fly into the clear,blue sky.Unwillingly,she lifted him from the cage and tossed him softly into the air.The lucky bird circled once,twice,three times.

The girl watched delightedly at the bird.Her heart was no longer concerned with her loss.What she wanted to see was that the bird could fly happily.Suddenly the bird flew closer and landed softly on her shoulder.It sang the sweetest tune that she had ever heard.

Remember,the fastest way to lose love is to hold on it too tight;the best way to keep love is to give it wings!

小题1:After the girl found the two birds,she________.

A.became delighted at once

B.treated them for a long time

C.took them to their home

D.fed them and raised them小题2:Why did the girl grasp the stronger bird wildly?

A.Because the girl disliked the bird any longer.

B.Because the bird wanted to fly alone.

C.Because the girl loved the bird deeply.

D.Because the bird intended to found some food.小题3:The underlined word “tossed” in the passage means________.

A.throw someting with slightly force

B.give up something happily

C.hold something fast

D.cast something without patient小题4:What can we learn from the passage?

A.Catch what you can catch on your way to success.

B.Going too far is as bad as not going far enough.

C.The best things come when you least expect them to.

D.A bird in the hand is worth two in the bush.

题型:单项选择题

安全阀的特点是()

A.卸压快

B.流量大

C.设定压力可随便修改

D.需不定期进行检修

题型:单项选择题

最小变化法

题型:单项选择题

不是早产常见原因的是()

A.急性肾盂肾炎

B.胎膜早破

C.双角子宫

D.羊水过多

E.胎儿脑积水

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