皮皮学，免费搜题
登录
搜题
【单选题】
根据《建筑设计防火规范》规定，建筑排烟口应设置在顶棚或靠近顶棚的墙面上，且与附近安全出口沿走道方向相邻边缘之间的最小水平距离不应小于1.5m。设在顶棚上的排烟口，距可燃构件或可燃物的距离不应小于（）mA.
0.7
B.
1.0
C.
0.6
D.
0.5
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【多选题】Why is ATP-driven Na + or H + important?
A.
In the plasma membrane of an animal cell, an ATP-driven Na + pump transports Na + out of the cell against its electrochemical gradient; this Na + can then flow back into the cell, down its electrochemical gradient, through various Na + gradient-driven pumps.
B.
The influx of Na + through these gradientdriven pumps provides the energy for the active transport of many other substances into the cell against their electrochemical gradients. If the ATP-driven Na + pump ceased operating, the Na + gradient would soon run down, and transport through Na + gradient-driven pumps would come to a halt.
C.
For this reason, the ATP-driven Na + pump has a central role in the active transport of small molecules across the plasma membrane of animal cells.
D.
Plant cells, fungi, and many bacteria use ATP-driven H + pumps in an analogous way: in pumping H + out of the cell, these proteins create an electrochemical gradient of H+ across the plasma membrane that is subsequently harnessed for solute transport.
【单选题】The various pumps and lines are _____ to some extent so that each pump can act as an alternative for another.
A.
interlocked
B.
interconnected
C.
interfered
D.
interacted
【简答题】表征某工程项目 ,反映引进工程其他建设费用的预算表格是 。
相关题目：
参考解析：
知识点：
题目纠错 0
发布
