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【简答题】
电路如图所示,求电路中对角线电压U及总电压Uab。
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【单选题】Suppose that Sphere X had become unfastened from the floor of the vessel during Trials 1 and 7. During which of these trials would Sphere X more likely have undergone the lesser amount of acceleration...
A.
Trial 1, because the magnitude of the electrical force exerted by Sphere Y on Sphere X was greater in Trial 1 than in Trial 7.
B.
Trial 1, because the magnitude of the electrical force exerted by Sphere Y on Sphere X was less in Trial 1 than in Trial 7.
C.
Trial 7, because the magnitude of the electrical force exerted by Sphere Y on Sphere X was greater in Trial 7 than in Trial 1.
D.
Trial 7, because the magnitude of the electrical force exerted by Sphere Y on Sphere X was less in Trial 7 than in Trial 1.
【单选题】下列各物质的分类，名称（或俗称），化学式（或结构简式）对应错误的是（）。
A.
酸式盐碳酸氢铵NH4HCO3
B.
化合物福尔马林HCHO
C.
非电解质干冰CO2
D.
糖类纤维素( C6H10O5)n
【单选题】氦是太阳 中含量较多的元素,其元素符号为 A . H B . He C . N D . O 28. 引起温室效应的主要物质是 A . SO 2 B . CO C . CO 2 D . 可吸入颗粒物 29. 属于氧化物的是 A . O 2 B . H 2 O 2 C . NaCl D . H 2...
A.
31,39,41
B.
27，29，35,42，43
C.
28,30,33,37,40,45
D.
32,34,44,46
【简答题】（12分）无机化合物可根据其组成和性质进行分类： （1）上述所示的物质分类方法名称是 。 （2）以Na、K、H、O、S、N中任两种或三种元素组成合适的物质，分别填在下表中②③⑥后面。（各空填写一个化学式即可） 物质类别 酸 碱 盐 氧化物 氢化物 化学式 ① HCl ② ③ ④Ba(OH) 2 ⑤Na 2 CO 3 ⑥ ⑦ CO 2 ⑧ Na 2 O ⑨ NH 3 ⑩H 2 O （3）写出⑦转化为...
【单选题】Suppose that all 6 genes are transferred from a donorbacterium to a recipient bacterium. Under this condi-tion, which student(s) would argue that Gene A couldbe the last gene transferred?
A.
Student 2 only
B.
Student 4 only
C.
Students 2 and 4 only
D.
Students 3 and 4 only
【单选题】下列化学式与其名称的对应关系正确的是
A.
软脂酸 C 17 H 33 COOH
B.
纯碱 Na 2 CO 3 ·10H 2 O
C.
纤维素[C 6 H 7 O 2 (OH) 3 ] n
D.
丙氨酸 CH 2 (NH 2 )CH 2 COOH
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