采煤机水系统功能是()。A、喷雾B、调高C、控制系统流量D、控制系统压力E、冷却

题型:多项选择题

问题:

采煤机水系统功能是()。

A、喷雾

B、调高

C、控制系统流量

D、控制系统压力

E、冷却

考点:采煤机司机考试采煤机司机考试题库
题型:多项选择题

阅读理解。

     In learning English, one should first pay attention to listening and speaking. It is the ground work of reading and writing. You’d better try your best to speak while you do much listening.

     Don't be afraid of making mistakes.But be careful not to let them stop you from improving your English. While you are doing this, a good way is to write---keep a diary, write notes or letters,  then if you can,

ask some others to go through what you have written and tell you where there is a mistake. Many mistakes in your speaking will be easily found when you write.

     Through correcting the mistakes, you can do better in learning English. If you are slow in speaking, don't worry. One of the helpful ways is reading, either aloud or to yourself. The important thing is to choose

something interesting to read. It mustn’t be too difficult for you.

When you are reading in this way, don't stop to look up the words if you call guess their meanings when

they have nothing important to do with the sentence. You can do that some other time.

1. For the beginners, listening and speaking is ______.

A. more important than reading and writing

B. not so important as reading and writing

C. as important as reading and writing  

D. not so useful in learning English

2. When you are speaking, ______.

A. you should nlllk6 any mistakes    

B. you must speak slowly

C. it doesn’t matter if you make mistakes

D. you’d better take a dictionary with you

3. One of the good ways to find out your mistakes in your speaking is to______.

A. speak as much as possible    

B. write notes or letters

C. ask some Americans to talk with you  

D. read more English books

4. If you want to be fast in speaking, you should choose something ______.

A. difficult to read aloud                

B. necessary to read to yourself

C. interesting to read aloud or to yourself    

D. important to read aloud

5. In reading, if you meet a new word which has something important to do with the sentence, you’d better______.

A. stop to look it up    

B. go on reading

C. stop reading at once  

D. not stop to look it up    

题型:多项选择题

某高校有高级教师18人,一级教师12人,正高级教师6人,需从他们中抽取一个容量为n的样本做代表,如果采用系统抽样和分层抽样方法抽取,都不用剔除个体;如果容量增加一个,则采用系统抽样时,需要在总体中剔除1人,则样本容量n为______.

题型:多项选择题

等渗性脱水的血清钠浓度是:

A.80~100mmol/L

B.100~120mmol/L

C.130~150mmol/L

D.150~170mmol/L

E.170~200mmol/L

题型:多项选择题

在“口述历史”发展过程中,历史学家曾经为“怎样的人才能成为被访谈者”而争论。就研究上世纪六七十年代广东知青(知识青年上山下乡)问题来说,合适的访谈对象是

①广东老知青

②当年政府“知青办”负责人

③知青的街坊邻居

④插队地区农民

A.①②

B.①②③

C.①②④

D.①②③④

题型:多项选择题

请完善程序(程序文件名:Java_3.java)并进行调试。请在下画线处填入正确内容,然后删除下画线。请勿删除注释行和其他已有的语句内容。
[题目要求]
统计一个英文文本字符串包含的英文元音字母的个数,使程序的运行结果如下:
The text contained vowels:88
源程序:
public class Java_3
public static void main(String[] args)
String text = " Beijing, the Capital City, is the political, "
+ "cultural and diplomatic centre of China. It has"
+ "become a modern international cosmopolitan city"
+ " with more than 11 million people. The Capital"
+ " International Airport, 23.5 km from the city centre,"
+ "is China’s largest and most advanced airport. " ;
int vowels =0;
int (1) = text.length();
for(int i = 0;i<textLength; i++)
char ch=Character.toLowerCase( text. (2) );
if(ch==’a’||ch==’e’||ch==’i’||ch==’o’||ch==’u’)
(3) ;

System.out.println( "The text contained vowels:" + vowels +"\n");


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