实验设计:给你一把米尺(木直尺),两段细绳,一个已知质量为m的钩码,测出所给米尺

题型:实验题

问题:

实验设计:给你一把米尺(木直尺),两段细绳,一个已知质量为m的钩码,测出所给米尺的质量.要求:

(1)写出实验的简要步骤.

(2)根据所测的物理量,写出米尺质量的表达式.

考点:杠杆的平衡条件
题型:实验题

We drink tea every day. But more than three hundred years ago most of the people in Europe (欧洲) did not know anything about tea. Some people heard about it, but very few of them know what to do with it.

  There is a story about an English sailor (水手) who went to countries in the east,the west and the south. He went to India and China. One day he came home and brought some tea as a present for his mother. She told her friends about the present and asked them to a “tea party”. When her friends came to the “tea party”, the old woman offered (给) them brown tea-leaves (茶叶). The old woman’s friends began to eat them. Of course, nobody liked the tea-leaves.

  At that time the sailor came in. He looked at the table and said, “Mother, what have you done with the tea?”

  “I boiled (煮) it,as you said.”

  “And what did you do with the water?”

  “I threw it away, of course.” answered the old woman.

  “Now you may throw away the leaves, too.” said her son.

(    ) 1. Most of the people in Europe ________.

     A. drank tea every day 300 years ago        B. drink tea every day

     C. know nothing about tea               D. like to eat the tea-leaves

(    ) 2. One day the English sailor brought his mother some tea from ________.

     A. countries in the west                   B. countries in the south

     C. India or China                       D. a tea shop in England

(    ) 3. The sailor’s mother asked her friends to her house, because ________.

     A. the sailor told her to

     B. she wanted to ask her friends what to do with the tea

     C. she liked to show off (炫耀)

     D. she wanted to sample (品尝) the tea together with her friends

(    ) 4. At the “tea party”,________.

     A. all the woman’s friends spoke highly of the tea

     B. nobody knew what to do with the tea

     C. the woman offered her friends some dried (干的) tea

     D. the woman gave her friends each a glass of tea water

(    ) 5. What mistake did the old woman make? She ________.

     A. boiled the tea                       B. did as the sailor said

     C. poured away the water                D. didn’t throw away the tea-leaves

题型:实验题

褚先生现年50岁,还有l0年退休,拟给自己在60岁之后建立一个20年长期护理计划,每月支出300元(按期末计),若以年为计算单位,假设年均投资收益率退休前后均为3%。则该计划当前的现值以及退休前每年积累额分别是()。

A.53558.91元,5355.89元

B.39852.86元,4671.97元

C.53558.91元,6280.60元

D.39852.86元,6097.37元

题型:实验题

请完善程序(程序文件名:Java_1.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:
完成程序并运行,得到的结果如下:
*****在初始化之前*****
x=0 y=0 z=0
*****在初始化中*****
x=20 y=30 z=5
*****在初始化之后*****
x=20 y=30 z=0
源程序:
class Variable
int x=0, y=0, z=0; //类变量
void init(int x, int y)
(1) =x;
this.y=y;
int z=5;//局部变量
System.out.println("*****在初始化中*****");
System.out.println("x="+x+"y="+y+"z="+z);


public class Java_1
public static void main(String[]args)
Variable v=new (2) ;
System.out.println("*****在初始化之前*****");
System.out.println("x="+v.x+"y="+v.y+"z="+v.z);
v.init(20,30);
System.out.println("*****在初始化之后*****");
System.out.println("x="+v.x+"y="+v.y+"z="+v.z);


题型:实验题

人类肠道正常菌群中数量最多的是()

A.无芽胞厌氧菌

B.大肠埃希菌

C.肠球菌

D.肠杆菌

E.白假丝酵母菌

题型:实验题

病室的坏境要求有()

A.声音30-40分贝

B.室温18-20

C.温度50%-60%

D.墙壁全部采用白色

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