九下

axi with the hard living condition. A. to arrive B. in arriving C. on arrive D. at arriving 4. Most people get sick ___ the bad weather. A. because B. as C. because of D. since 5. Confucius is a

rtsman. 32. Ma Ji was born in Beijing in 1934. He was a famous crosstalk master. 33. Yang Liwei was born in Liaoning Province. He has a happy family. He loves his wife and son. 34. Wang Xuan was born

India on business. He hired a car and asked an Indian to drive him. When he told his driver to take him to his office, the Indian shook his head at once. The officer said again and the driver shook

the following questions? Who chooses your friends? Do you choose your friends or your friends choose you? Have you got a good friend your parents don’t like? Your answers are wele. 根据短文内容，回答问题。

D. ever since 11. Do you like playing chess? Yes. But I don’t play chess ___ you. A. as good as B. as well as C. so good as D. so better than 12. As we know, China was the first country in the world

he story works as a ____. A. worker B. doctor C. farmer D. clerk ( )27. The writer tried to go to the cinema every day, but really got there ____. A. five times B. three times C. four times D. twice

Ω的电阻 R1与电阻 R2串联后，接在电压为 6 V的电源两端，测得电路中的电流为 O． 1 A，则电阻 R1两端的电压为 ______V，电阻 R2 消耗的电功率为 ________w。 11．照明电路中，常用的白炽灯有“ 220 V 40 w”和“ 220 V 60 w”两种，它们的电阻值在正常工作时，大约是 _______和 ________。 12．关于电功、电功率的说法，正确的是 (

只相同的灯泡串联在一起接在某一电 源两端，每只灯泡两端的电压均为 U1，若把 这两只灯泡并联起来接在原来的电源上，每只灯泡两端的电压为 U2，则 ( )。 A． U1： U2=1： 1 B． U1： U2=2： 1 C． U1： U2=1： 4 D． U1： U2=1： 2 11．如图所示， R阻值 20Ω， R1 最大阻值 30Ω，当滑片从左向右滑动过程中，电压表示数的变化范围是 ( )。

开关 N．柴油机 O．蓄电池 6．在下列各图中，闭合开关后，属于断路的是 ____图；属于短路的是 ____图；电路不 完整，不能工作的是 ____图；灯泡能发光的是 ____图。 7．写出电路图中各字母所代表的元件名称。 A是 _______， B是 ________， C是 _______， D是 ________， E是 _______， F是 ________。 8．下列关于电源的说法中

样多 14．一台标有“ 220 V 1000 w”的电熨斗，在正 常使用时， 10 min内能产生的热量 是 ( )。 A． 3． 6 106J B． 6 105J C． 104J D． 3． 6 105J 15．以下单位中，属于电热单位的是 ( )。 A． W B． V A C． V2／Ω D． V A S 16．如右图所示，将两根电炉丝 R R2 串联起来，接到电路中。 甲