下列器件中属于省力杠杆的是（ ）
A．瓶盖起子
B．筷子
C．镊子
D．天平
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--Do you think it will be fine tomorrow?
---_______________. It has rained for so many days.
A．I hope not.
B．I am sure it will
C．I hope so
D．No
| 完形填空。 | |||
| The town I live in is about to put cameras at all traffic lights to catch people who run red lights. It___1__me of how many people I've seen who take the yellow light as a __2__to go faster. I also can't understand why people don't move when the traffic light has turned green. Above all, there are those___3__situations in which someone doesn't even ___4__that the light turns red, and just keeps going. That is why so many ___5__happen! All these situations make me__6___the purpose of traffic lights. ___7___, it's even more frightening to imagine letting people make their own decisions at __8___ crossroads. Do the biggest cars get to go first? Who decides who goes next? So I guess I do like the idea of a system to__9___traffic. And I'll do my best to___10__the traffic rules: to go, to be cautious, and to stop when I'm__11___to. It occurs to me that my___12__ have done much the same for me__13___teaching me how to live. They have given me many__14__ lights: to get along well with others, to listen and talk to them, to help others, and to__15___with joy and purpose. They have also given me some red lights ___16__my life goes astray(误入歧途): not to be greedy, to keep my temper, and to control my desires. And there___17__have been some yellow caution lights: to watch how much I drink, to keep control of my behavior, and to___18___ school regularly and work hard. If I obey these rules, my life will be as__19___as it can be. Just as I'm wise to pay attention to the traffic lights when I'm walking across the street, I'm wise to pay attention to the " ___20__signals" given to me by my parents. | |||
| ( )1.A. suggests ( )2.A. sight ( )3.A. instant ( )4.A. notice ( )5.A. events ( )6.A. think of ( )7.A. Besides ( )8.A.noisy ( )9.A. control ( )10.A. learn ( )11.A. supposed ( )12.A. teachers ( )13.A. in charge of ( )14.A. safe ( )15.A. live ( )16.A. unless ( )17.A. still ( )18.A. start ( )19.A. good ( )20.A. traffic | B.informs B. signal B. exciting B. sense B. problems B. wonder about B. Anyway B.narrow B. direct B. obey B. used B. friends B. in face of B. green B. share B. when B. even B. attend B. colorful B. light | C. reminds C. message C. dangerous C. remember C. situations C. care for C. Instead C.crowded C. improve C. protect C. devoted C. leave C.in terms of C. beneficial C. work C. before C. only C. leave C. meaningful C. life | D. warns D. switch D. cautious D. feel D. accidents D. worry about D. However D.key D. serve D. carry D. delighted D. parents D.in danger of D. helpful D. communicate D. till D. also D. miss D. healthy D. confidence |
流体流过壁面时同壁面之间产生的热量交换称（）.
对带活性炭过滤层的花粉滤芯描述错误的是（）
A.可过滤粉尘及花粉
B.滤除气态的有害物质如苯一氧化氮等
C.长效终生免维护
D.如车辆经常在路况及环境相对恶劣的情况下使用，空调系统花粉滤清器更换周期应适当缩短
A321飞机人工释放工具有（）个。
A.4
B.5
C.1
D.3