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【单选题】
正丁烷绕 C 2 —C 3 轴旋转时,所形成的下列极限构象,相对能量由高到低的顺序为( ) 1部分重 叠式 2全重 叠式 3邻位交又 式 4对位交叉式A.
②①③④
B.
②①④③
C.
③④①②
D.
④③①②
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【单选题】男，56岁，腹痛2天。检查：腹膜刺激征明显，呼吸深而快，神志恍惚，血压下降。血HCO2-7mmol／L。诊断可能是？
A.
呼吸性碱中毒
B.
呼吸性酸中毒
C.
中度代谢性酸中毒
D.
重度代谢性碱中毒
E.
重度代谢性酸中毒
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