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【单选题】
以单纯扩散的方式跨膜转运的物质是( )A.
Na +
B.
Ca 2+
C.
O 2 和C0 2
D.
葡萄糖
E.
ub>C
F.
ub>
G.
.水溶性小分子,借助细胞膜上的载体蛋白或通道蛋白的帮助进入细胞的过程是( )
H.
单纯扩散
I.
扩散
J.
主动转运 K. 入胞作用
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【简答题】某些物质的转化关系如下图所示（不是所有的产物都标出）。已知： ① 若用两根玻璃棒分别蘸取A的浓溶液和浓盐酸并使它们接近时，有大量白烟生成； ② 甲是由两种单质直接化合得到的一种淡黄色固体； ③ 乙为一种金属单质，常温下，它在浓硝酸钝化； ④ D溶液呈碱性，F为溶液。 （1）A属于___________ A、电解质 B、非电解质 （2）请写出C、G的化学式： C____________ G_____...
【简答题】Section C: News Broadcast exercise 1.mp3: In this section, you will hear 3 news items. Listen to them carefully and then answer the questions that follow. Questions 21 and 22 are based on the followin...
【单选题】Questions 22-25 are based on the passage you've just heard.
A.
Force ourselves to remember things.
B.
Practice and exercise consciously.
C.
Never stop learning.
D.
Try hard to remember things.
【单选题】设 与 是一阶线性微分方程 的两个不同的解,则下列说法不正确的是( )
A.
是对应齐次微分方程的解；
B.
是该微分方程的解；
C.
是对应齐次方程的通解；
D.
是该方程的通解。
【单选题】Questions 22 to 25 are based on the passage you have just heard.
A.
It means the year you take off and you’ll continue school with enough money.
B.
It means the year you have off between high school and college.
C.
It means the year you have off during your college life.
D.
It means the year you take off before high school.
【简答题】（1）硝酸钾是农业上常用的一种化肥，能够使农作物枝叶繁茂、增强抗倒伏、抗病虫害的能力，硝酸钾属于化肥中的___________。硝酸钾与任何酸、碱、盐都不会发生复分解反应，其原因是____________。 为了探究硝酸钾固体在水中溶解质量多少的影响因素，某研究小组开展了以下的探究活动，请你根据实验数据归纳出结论。 实验一： KNO 3 在20℃水中达到饱和时溶解的质量 结论：当_________...
【单选题】Questions 22 to 25 are based on the passage you have just heard.
A.
To stay safe.
B.
To save energy.
C.
To keep company.
D.
To protect the young
【单选题】Questions 19 to 22 are based on the passage you have just heard
A.
Take part in a cooking competition.
B.
Taste the beef and give her comment.
C.
Teach vocabulary for food in English.
D.
Give cooking lessons on Western food.
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