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【简答题】
“I sometimes get up at three or four in the morning to surf the Intern” “I check my e-mail almost forty times a day.” “I seldom spend less than three hours each time on the net.” “spend more time in chat rooms than with my 'real-life’ friends.” Do you know any people like these? They are part of a new addiction(瘾) called Internet addiction.According to experts,Internet addicts(迷)spend at least thirty to forty hours online every week.They lose control of the time they spend on the Internet. For example,one college student was missing for several days.His friends were worried and 1ooked for him everywhere but couldn’t find him.They called the police.The police found the student in the computer lab: he was surfing the Internet — for seven days straight. A study shows that about six to ten percent of Internet users become addicted.The teenager spend more time on the Internet than with friends and family. That’s why some experts worry most about young people. Is “surfing the Internet” a hobby or all addiction for you? You may have a problem if you have one of the following symptoms(症状): ★You go out with your friends less and less. ★You can’t wait to get online again. ★You’ve decided to spend a short time online,but then you spend several hours. ★You do not go to important family events or you do not do school projects because you like to spend hours on the Internet. What is the solution? Some experts suggest that people set strict limits on their time for Internet use. You have to learn to control it,or the Internet would control you. 小题1:How many hours does an Internet addict spend online every week according to experts? 小题2:Where was the missing college student found? 小题3:Why do some experts worry most about young people? 小题4:What is one symptom of Internet addiction? 小题5:How can Internet addicts solve their problem? 小题6:What might be the title of this passage? (In no more than TEN words)
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【单选题】将一定质量的镁和铝混合物投入200 mL稀硫酸中,固体全部溶解后,向所得溶液中加入NaOH溶液,生成沉淀的物质的量与加入的NaOH溶液体积的变化关系如图所示。则下列说法不正确的是(   )
A.
镁和铝的总质量为9 g
B.
最初20 mL NaOH溶液用于中和过量的稀硫酸
C.
生成的氢气在标准状况下的体积为11.2 L
D.
氢氧化钠溶液的物质的量浓度为5 mol·L -1
【单选题】下列关于实验的误差分析不正确的是
A.
用已经潮解的烧碱配制标准NaOH溶液,测得盐酸含量偏高
B.
用浓硫酸配制一定物质的量浓度稀硫酸时,用量筒量取浓溶液的体积时仰视读数,所得溶液的浓度偏低
C.
用盐酸滴定含Na 2 O的NaOH样品,所得结果偏高
D.
用移液管取盐酸待测液时没有润洗,测得盐酸含量偏低
【判断题】在Photoshop中,配合ALT键可以增加选择区域。
A.
正确
B.
错误
【单选题】新生儿出生后1分钟,查:心率110次/分,呼吸不规则,四肢活动佳,口周青紫,吸痰时有咳嗽反应。该新生儿阿氏评分是
A.
6分
B.
7分
C.
8分
D.
9分
E.
10分
【判断题】酰氯和酸酐能对苯环发生亲电取代反应,是很好的酰基化试剂。酰氯和酸酐对胺的酰基化反应也是亲电取代反应。
A.
正确
B.
错误
【单选题】新生儿出生后1分钟的Apgar评分及其意义,错误的是
A.
满分为10分,属正常新生儿
B.
7分以上只需进行一般处理
C.
4分以下缺氧严重,应紧急抢救
D.
应于出生5分钟内再次评分
E.
评分根据呼吸、心率及皮肤颜色
【简答题】(12分)欲配制一定温度下的某NaOH溶液,已知:该溶液体积为 V mL,溶液密度为 d g/cm 3 ,质量分数(质量百分比浓度)为 w %,物质的量浓度为 c mol/L,溶液中含氢氧化钠的质量为 m g. 试回答下列问题. (1)计算:用 w 、 d 表示溶液中溶质的物质的量浓度 c 为________________. (2)某学生用托盘天平称量小烧杯的质量(烧杯中盛NaOH),称量前把游...
【多选题】测定硬度的方法比较多,常用的硬度实验法有( )
A.
冲击硬度
B.
布氏硬度
C.
洛氏硬度
D.
维氏硬度
【简答题】将CO 2 通入NaOH溶液中,所得产物随通入的CO 2 的物质的量的不同而不同。完成下列填空。 (1)250 mL 1 mol/L的NaOH溶液,最多可吸收CO 2 L(标准状况下)。 (2)向250 mL 2 mol/L的NaOH溶液中通入一定量CO 2 ,溶液增重4.4 g,将所得溶液蒸干,计算所得固体中各成分的物质的量。 向未知浓度、体积为V L的 NaOH溶液中缓缓通入一定体积(标准状况...
【单选题】新生儿出生后1分钟的Apgar评分及其意义,不正确的是
A.
评分根据有无惊厥及皮肤颜色
B.
应于出生5分钟时再次评分
C.
4分以下缺氧严重,应紧急抢救
D.
7分以上只需进行一般处理
E.
满分为10分,属正常新生儿
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