常操作温度应在温度测量仪表量程的（）范围内。
A.60%～80%
B.50%～90%
C.40%～80%
D.30%～70%
参考答案：D
Directions:
You are planning to study in a foreign university. Write a letter of application to ask for some materials. Write to tell them
1) your educational background and
2) what major you want to study.
You should write about 100 words on ANSWER SHEET. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You don’t have to write the address.
我国国家养老保险模式时期的单位保险阶段从1969年到（）年。
A、1986
B、1990
C、1994
D、1998
