锯齿波的形成则主要靠晶体管V12、电容C2、电阻R5、电位器RP组成的( )电路。
A．微分
B．积分
C．RC耦合
D．RC并联
参考答案：B
为某日某时刻某纬线圈至极点的昼夜分布状况，阴影为黑夜。回答9～11小题。
小题1:该纬线圈的纬度可能是
A．0°
B．23°26′S
C．30°N
D．30°S小题2:关于T地的说法正确的是 ( )
A．昼夜平分 B．昼短夜长
C．位于北半球、西半球 D位于南半球、西半球
小题3:关于p地昼长的叙述正确的是 ( )
A．昼长10小时
B．昼长11小时
C．昼长12小时
D．昼长13小时
Directions:
You are about to graduate from a university in the coming month. Right now you are doing some job hunting. Write a letter of application to an American bank in your city to
1) introduce yourself briefly and
2) express your wish to join the company.
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.
