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举一反三
【单选题】β片层结构:
A.
只存在于α角蛋白中
B.
只有反平行结构,没有平行式结构
C.
α螺旋是右手螺旋,β片层是左手螺旋
D.
主链骨架呈锯齿形成的片层
E.
肽平面的二面角与α螺旋的相同
【单选题】Mars Global Surveyor is the oldest of five NASA robotic devices, which is designed to find out signs that Mars once had water;and it had been taking detailed pictures of the red planet for a decade. U...
A.
its life
B.
its orbit
C.
its power
D.
its position