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【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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【判断题】ŋ 、m、n都是鼻音,都是浊音。
A.
正确
B.
错误
【单选题】extrovert
A.
retrovert
B.
subvert
C.
introvert
D.
reconvert
【单选题】什么情况下采用灭火装置机械应急操作?( )。
A.
、发现火灾发生后
B.
、火灾报警信号发出后
C.
、人员撤离防火房间后
D.
、自动灭火控制失效后
【单选题】在句子An extrovert is someone who is active and confident, enjoying spending time with other people中,extrovert中,extrovert是什么样的人?
A.
性格内敛的人
B.
不喜欢交际的人
C.
性格外向的人
D.
沉默寡言的人
【判断题】酷家乐只能生成图纸,不能生成户型图
A.
正确
B.
错误
【单选题】已知平面直角坐标系中,角α的始边与x正半轴重合,终边与单位圆(圆心是原点,半径为1的圆)交于点P.若角α在第 一象限,且 tanα= 4 3 .将角α终边逆时针旋转 π 3 大小的角后与单位圆交于点Q,则点Q的坐标为(  )
A.
( 3 3 -4 10 , 4 3 +3 10 )
B.
( 3 3 +4 10 , 4 3 -3 10 )
C.
( 3-4 3 10 , 4+3 3 10 )
D.
( 3+4 3 10 , 4-3 3 10 )
【单选题】From the conversation, we get the impression that Victoria is______.
A.
pragmatic
B.
extrovert
C.
wilful
D.
calculating
【简答题】化学课上老师和同学们对有关溶液的知识进行了讨论和探究,其内容如下: (1)以上三位同学对溶液特征的描述正确的是______同学. (2)影响固体物质在水中溶解能力的因素有哪些?针对这个问题,老师引导同学们进行了一系列实验,下表列出了从探究实验中获取的部分数据,王华根据表中的数据绘制了一条溶解度曲线,它是表中______物质的溶解度曲线. 20℃ 40℃ 60℃ A 36.4g 36.6g 37.3...
【单选题】已知α是第二象限角,若角α的终边与单位圆的交点为P,则点P的坐标为(  )
A.
(-cosα,sinα)
B.
(-sinα,cosα)
C.
(cosα,sinα)
D.
(sinα,cosα)
【单选题】According to the passage, shy people______.
A.
have greater difficulty than extrovert ones
B.
are not good at acting
C.
may well do a good job in a speech
D.
are better speakers in the public eye
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