标准误的应用包括（） A.表示观察值分布的变异程度 B.表示抽样误差的大小 C.估计

赵丽娘感叹自己颜色如花，岂料命如什么（）。

A、断井

B、颓垣

C、一叶

D、晴丝

有一电阻值约为20Ω、额定功率约为7.2W的电阻，现准备用伏安法测量多组数据，借助I-U图象较准确地测其阻值（电阻两端电压需从零开始逐渐增大），实验室提供的器材有：

A. 电流表（量程0-3A，内阻约0.1Ω）

B. 电流表（量程0-0.6A，内阻约0.5Ω）

C. 电压表（量程0-3V，内阻约3kΩ）

D. 电压表（量程0-15V，内阻约15kΩ）

E. 滑动变阻器（阻值0-10Ω，额定电流2A）

F. 直流电源（电动势12V，内阻不计）

G. 开关及导线若干

小题1:要使测量误差尽量的小，电流表应选择  ____，电压表应选择  ___ 。（填序号字母）

小题2:请按实验要求完成测量电路的实物连接。

:学科

可以找到CIDS的CLASS3故障信息的是（）

A.PTP的’，系统状态"

B.PTP的’，系统测试"

C.PTP的’，系统编程，

D.PTP的上一次航段故障

论述实现装卸搬运合理化的途径。

The teenage year from 13 to 19 were the most difficult time for me . They were also the best and worse years in my life . At the first, I thought I knew everything and could make decisions by yourself. However, my parents didn’t seem to think such. They always tell me what to do and how to do it. At one time , I even felt my parents couldn’t understand me so I hoped I could be freely from them. I showed them I was independent by wear strange clothes. Now I am leaving home to college. At last, I will be on my own, but I still want to have my parents to turn to whenever need help.

10（）