简述电容滤波器的滤波原理。

阅读理解。

                                                 Cooking Demonstration (演示) Today at 10 am

                                                        Quick Asian Noodles by Lynn Lee

     See how quickly you can make a delicious noodle meal in your own kitchen. Lynn Lee, a well-known

  cooking instructor and cookbook author, prepares four meals in less than an hour. Two meals will feature

  boiled noodles and two are prepared by stir-frying. These meals are fit for vegetarians, but you can add

  meat or fish if preferred.

     Take advantage of the special offer for people in today's audience: get Lynn's new book for half price.

  Come today and take home Quick Asian Noodles for only $12.49 instead of $24.98.

     Next week's demonstration: Food in Chinese History

     The cook's Bookshop—2nd floor in the Megmall

1. Lynn Lee will cook _____ at 10 am today.

    A. vegetables      

    B. fish  

    C. meat        

    D. noodles

2. Lynn Lee not only teaches how to cook but also _____ .

    A. writes books on cooking  

    B. has a large food shop

    C. studies Chinese history    

    D. sells Asian noodles

3. The program next week is about _____ .

    A. Asian noodles                

    B. food in Chinese history

    C. the cook's bookstore                

    D. Lynn Lee's life

4. It can be seen from the passage that _____ .

    A. Lynn Lee's meals are not for vegetarians

    B. people can get Lynn Lee's new book without paying anything today

    C. Lynn Lee will cook meals in different ways today

    D. the cook's bookstore is on the first floor in the Megmall

国际多式联运最大的好处是它能够降低运输成本的优点

将1.12g铁粉加入25mL2mol/L的FeCl₃溶液中，充分反应后，其结果是( )

A．铁恰好将Fe³⁺全部还原

B．往反应后溶液中滴入KSCN溶液，不显红色

C．溶液变为浅绿色

D．Fe²⁺和Fe³⁺物质的量之比为6：1

互见中，一机动船与下列（）航向交叉相互驶近，致有构成碰撞危险，适用交叉相遇局面条款。

A.失去控制的船舶

B.操纵能力受到限制的船

C.限于吃水的船舶

D.用机器推进使用绳钓捕鱼的船舶

动物实验室的安全防护分几级？（）

A．一级

B．二级

C．三级

D．四级