如图所示，一个木箱内装有两只灯泡，用导线在箱内将它们连好，A_爱下问搜题

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问题问答题

如图所示，一个木箱内装有两只灯泡，用导线在箱内将它们连好，A、B、C是三根引出的接线柱，将单刀双掷开关接B点时，只有一盏灯亮；当开关接C时，两盏灯都亮，画出箱内这两盏灯的连接图．

答案

根据题意知，在干路应有一盏灯泡，开关接B时，只将此灯泡接入电路；开关接A时，将此灯泡与另一灯泡串联，如图所示：

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完形填空

完形填空。

       Mary is an English girl. She is 13 years old .She's always   1 blue coat. Now she   2   in a middle school in
Shanghai.   3 father and mother   4 in China, too. They are both 5 . They teach English in a college (大学).
6 do they do on Sundays? They often go to the park   7 Sunday morning.
       Mary likes Chinese food very much,   8 she doesn't like Chinese tea. Mary likes   9 a lot . She has a pet
dog at home. Its name is Kitty.   10 are good friends. They are often together on Sundays.

( ) 1. A. in
(    ) 2. A. works
(    ) 3. A. Her
(    ) 4. A. am
( ) 5. A. workers
( ) 6. A. What
(    ) 7. A. in
(    ) 8. A. and
(    ) 9. A. books
( ) 10. A. They

B. from
B. goes
B. His
B. is
B. teachers
B. Where
B. on
B. but
B. songs
B. Them

C. with
C. studies
C. Hers
C. are
C. doctors
C. Whose
C. at
C. so
C. pets
C. Their

填空题

（）应建立健全储罐操作、使用、维护规程和岗位责任制，并严格执行。