简述抒情文在语文教材中的地位。

如右图所示，分别在A、B两点放置点电荷和在AB的垂直平分在线有一点C，且AB=AC=BC＝6×m，静电力常量k=9.0×10⁹N·m²／C²，试求：

（1）C点的场强大小．

（2）如果有一个电子（电子电量）静止在c点，它所受的电场力的大小和方向如何?

未锻轧的精炼铅(符合hs注释规定)(7801.1000)126.未锻轧的非合金锡(符合hs注释规定)()

小题1:What you have just read is a________.

A．note

B．report

C．schedule

D．poster小题2:What is going to take place on 2 February,2013?

A．A big event to welcome a Chinese new year.

B．A social gathering to raise money for wildlife.

C．A party for close friends to meet and have fun.

D．A meeting of Kwun Tong High School students.小题3:How much do you have to pay in total if four of you go together?

A．$20.

B．$40.

C．$60.

D．$80.小题4:Which of the following statements is true?

A．Tickets are sold in Kwun Tong High School.

B．It’s unnecessary to take soft drinks with you.

C．Free digital cameras are provided for everybody.

D．Festival food will be served without extra charge.

阶级矛盾和统治阶级内部矛盾的不可调和性，是警察产生的社会条件。 ( )

下面不属于非金属储罐的是（）。

A.石砲耀

B.钢筋混凝土罐

C.钢储罐

D.耐油橡胶软体储罐