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【单选题】
室温下向10 mL pH＝3的醋酸溶液中加水稀释后，下列说法正确的是A.
溶液中导电粒子的数目减少
B.
溶液中c（CH 3 COO - ）/[c（CH 3 COOH）· · c（OH - ）]不变
C.
醋酸的电离程度增大，c（H ＋ ）亦增大
D.
再加入10 mL pH＝11的NaOH溶液，混合液pH＝7
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【简答题】创建建工墙体练习
【单选题】How many feedback resistors are found in a 3-input voltage summing circuit that is constructed around an op-amp?
A.
0
B.
1
C.
2
D.
3
【简答题】已知Na 2 CO 3 (s)和H 2 O(l)可以生成如下三种水合物：Na 2 CO 3 ·H 2 O(s)，Na 2 CO 3 ·7H 2 O(s)和Na 2 CO 3 ·10H 2 O(s)。试求：(1)在大气压力下，与Na 2 CO 3 水溶液和冰平衡共存的水合盐的最大值；(2)在298K时，与水蒸气平衡共存的水合盐的最大值。
【多选题】How do voltage-gated ion channels work?
A.
Voltage-gated ion channels have domains called voltage sensors that are extremely sensitive to changes in the membrane potential: changes above a certain threshold value exert sufficient electrical force on these domains to encourage the channel to switch from its closed to its open conformation.
B.
A change in the membrane potential does not affect how wide the channel is open, but instead alters the probability that it will open. Thus, in a large patch of membrane containing many molecules of the channel protein, one might find that on average 10% of them are open at any instant when the membrane is at one potential, whereas 90% are open after this potential changes.
C.
When one type of voltage-gated ion channel opens, the membrane potential of the cell can change. This in turn can activate or inactivate other voltage-gated ion channels.
D.
Such circuits, which couple the opening of ion channels to changes in membrane potential to the opening of additional ion channels, are fundamental to all electrical signaling in cells.
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