问题
单项选择题
下列有关磁悬液的制作方法的叙述，是正确的是（）。
A.将磁悬液搅拌后，经一定时间后，仍有部分磁粉末沉淀下来的磁悬液，被认为是性能不良的
B.磁悬液中的磁粉量是取一定量的磁悬液倒入沉淀管，按磁粉的沉淀容积求出的
C.当磁悬液的浓度低于规定值时，应将磁悬液倒去
D.荧光磁粉磁悬液的规定浓度一般比非荧光磁粉磁悬液的规定值高
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
下列有关磁悬液的制作方法的叙述，是正确的是（）。
A.将磁悬液搅拌后，经一定时间后，仍有部分磁粉末沉淀下来的磁悬液，被认为是性能不良的
B.磁悬液中的磁粉量是取一定量的磁悬液倒入沉淀管，按磁粉的沉淀容积求出的
C.当磁悬液的浓度低于规定值时，应将磁悬液倒去
D.荧光磁粉磁悬液的规定浓度一般比非荧光磁粉磁悬液的规定值高
参考答案：B
| 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 |