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低承台桩基除了能承受竖向荷载外,也能抵抗一定的水平荷载和上拔力。()
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_ckda.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_panel_vip.png)
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- · 有6位网友选择 对,占比60%
- · 有4位网友选择 错,占比40%
A. 285
B. 271
C. 260
D. 250
对承台1描述正确的是()
A、矩形承台,截面尺寸长*宽*高为800*800*1200
B、垫层尺寸为1000*1000*100
C、承台为底标高为-2.300m
D、矩形截面,截面尺寸长*宽*高为1000*800*1300
A、将静力荷载下的单桩竖向承载力提高25%
B、桩周摩阻力需乘以液化影响折减系数
C、地震作用按地震影响系数最大值的10%取用
D、桩承担上部结构传来的竖向荷载和全部地震力
A.N角>N边>N中
B.N中>N边>N角
C.N边>N角>N中
D.N角>N中>N边
B.CO 与空气充分混合后点燃
C.用 H 2 还原 CuO 时,将装有 CuO 的试管加热,然后通入 H 2
D.H 2 与 N 2 混合后用火点燃
B.Most?commonly,?the?activated?G?protein?α?subunit?switches?on?the?adenylyl?cyclase,?causing?a?dramatic?and?sudden?increase?in?the?synthesis?of?cyclic?AMP?from?ATP.
C.To?help?terminate?the?signal,?a?second?enzyme,?called?cyclic?AMP?phosphodiesterase,?rapidly?converts?cyclic?AMP?to?ordinary?AMP.?Cyclic AMP phosphodiesterase is continuously active inside the cell. Because it eliminates cyclic AMP so quickly, the cytosolic concentration of this second messenger can change rapidly in response to extracellular signals, rising or falling tenfold in a matter of seconds.
D.Cyclic AMP is water-soluble,so it can, in some cases, carry the signal throughout the cell, traveling from the site on the membrane where it is synthesized to interact with proteins located in the cytosol, in the nucleus, or on other organelles. One?way?that?caffeine?acts?as?a?stimulant?is?by?inhibiting?this?phosphodiesterase?in?the?nervous?system,?blocking?cyclic?AMP?degradation?and?thereby?keeping?the?concentration?of?this?second?messenger?high.
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