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【多选题】
关于组成蛋白质的氨基酸结构，正确的说法有（）。A.
在α-碳原子上结合有氨基或亚氨基
B.
所有的伐一碳原子都是不对称碳原子
C.
组成蛋白质的氨基酸除一种外都是L型
D.
脯氨酸是唯一的一种亚氨基酸
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【单选题】If the doctor had been available, the child______.
A.
would not die
B.
might one die
C.
would not have died
D.
will not have died
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【多选题】某点的高度是海拔682m,其含义是( )。
A.
该点的绝对高程为682m
B.
该点的相对高程为682m
C.
该点至假定水准面的铅垂距离为682m
D.
该点至大地水准面的铅垂距离为682m
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