![](https://lstatic.shangxueba.com/jiandati/pc/images/pc_jdt_tittleico.png)
MRI的组织参数,包括下列哪几项()
A.质子密度
B.回波时间
C.流空效应
D.T2值
E.T1值
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_ckda.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_panel_vip.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_q_wyda.png)
- · 有2位网友选择 D,占比22.22%
- · 有1位网友选择 CD,占比11.11%
- · 有1位网友选择 CE,占比11.11%
- · 有1位网友选择 E,占比11.11%
- · 有1位网友选择 BD,占比11.11%
- · 有1位网友选择 AE,占比11.11%
- · 有1位网友选择 BE,占比11.11%
- · 有1位网友选择 ACDE,占比11.11%
A.质子密度
B.回波时间
C.流空效应
D.T2值
E.T1值
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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