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【简答题】
Zhou Yan, a Junior 3 student, wishes he never got a mobile phone. Last week, he went to see a doctor because his arms and fingers were injured. The doctor told him that he had “mobile phone disease”. A growing number of teenagers are getting “mobile phone disease” because more of them are using mobile phones. Zhou got his mobile phone five months ago. He sent messages to his friends with it all the time, even when going to bed. Zhou started to do badly in the exams because he spent so much time playing with his mobile phone. His mother got very angry with him. He didn’t stop playing with the mobile phone until his arms got injured. Yang Ling,a doctor, says that if someone uses his mobile phone too much, like Zhou Yan, he might get “mobile phone disease’. If teenagers find their arms or fingers hurt, they should go to see a doctor as soon as possible. Yang Ling said students should try to use their mobile phones less,especially at school. 小题1:Zhou Yan wishes he never got a mobile phone because____. A.it is useless to him B.it doesn’t work well C.it made his arms hurt D.his mother got angry with him 小题2:Zhou Yan didn’t do well in exams because______. A.he didn’t like studying B.he was ill and didn’t go to school C.he was afraid of exams D.he spent much time on the mobile phone 小题3:If someone has “mobile phone disease”, it means_______. A.the mobile phone brought him a disease B.something is wrong with his mobile phone C.he can’t live without the mobile phone D.he hates the mobile phone very much 小题4:Yang Ling thinks students should_______ A.go to see a doctor very often B.use mobile phones more when they are out of school. C.use mobile phones less. D.not use mobile phones anymore 小题5:The writer want to tell us___ in the article. A.using mobile phones too much is bad for our study and health B.only a few teenagers have mobile phones C.mobile phones can help students get out of trouble D.people shouldn’t use mobile phones
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【简答题】在配位滴定中一般不使用EDTA,而用EDTA二钠盐(Na 2 H 2 Y),这是由于EDTA ,而Na 2 H 2 Y ; EDTA钠盐(Na 2 H 2 Y)水溶液的pH约等于 ;当溶液的pH=1.6时,其主要存在形式是 ;当溶液的pH>12时,主要存在形式是 ( 已知EDTA的p K a1 ~p K a6 分别为0.9、1.6、2.0、2.67、6.16、10.26)
【单选题】语句〈 a name=“ second” 〉 text 〈 /a 〉的作用是( )。
A.
设置超级链接,链接到 second 页面上
B.
设置一个 锚记 为 second 的标记
C.
设置一个链接,指向 second 文件
D.
设置第二个链接
【单选题】已知 EDTA 的 p K a 1 ~p K a 6 分别为 0.9 , 1.6 , 2.0 , 2.67 , 6.16 , 10.26 。 pH = 11 的 EDTA 二钠盐水 溶液中 , 主要存在形式是 ( )
A.
H 3 Y -
B.
H 2 Y 2-
C.
HY 3-
D.
Y 4-
【单选题】杜威是现代最著名的美国()教育理论家。
A.
要素主义
B.
存在主义
C.
唯物主义
D.
实用主义
【单选题】杜威是现代最著名的美国( )教育理论家
A.
唯物主义
B.
存在主义
C.
实用主义
D.
要素主义
【简答题】已知 EDTA 的 p K a1 ~p K a6 分别是 0.9 , 1.6 , 2.0 , 2.67 , 6.16 和 10.26 , 0.10 mol/L EDTA 二钠盐 (Na 2 H 2 Y · 2H 2 O) 溶液的 pH 是 ______________ , [Y] 为 ________mol/L 。
【多选题】已知 EDTA 的 p K a 1 ~ p K a 6 分别为 0.9 , 1.6 , 2.0 , 2.67 , 6.16 , 10.26 。今在 pH > 12 的碱性溶液中,以 EDTA 滴定等浓度的 Ca 2+ ,已知在此条件下 Ca 2+ 不发生副反应。下列叙述不正确的是
A.
滴定至 50% 时, pCa = pY
B.
滴定至化学计量点时, pCa = pY
C.
滴定至 150% 时, pCa = pY
D.
滴定至 200% 时, pCa = pY
【判断题】已知 EDTA 的 p K a1 ~p K a6 分别是 0.9,1.6,2.0,2.67,6.16 和 10.26, 0.10 mol/L EDTA 二钠盐 (Na 2 H 2 Y·2H 2 O) 溶液的 pH 是 4.42 。
A.
正确
B.
错误
【简答题】杜威是现代最著名的美国()教育理论家。
【单选题】一水泥28天6个胶砂抗压强度试件的测值分别为35.0,41.0,43.0,42.0,46.0,39.0(单位:MPa),那么该水泥28天的强度为( )。
A.
43MPa
B.
41MPa
C.
42.2MPa
D.
该组试件作废(注:按新标准)
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