根据烃链是否饱和,可将脂肪酸分为饱和脂肪酸和不饱和脂肪酸。
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不饱和脂肪酸大多为顺式结构,只有极少数为反式结构。
A. 对
B. 错
自然界中的单不饱和脂肪酸的双键的位置一般在第9~10碳原子之间。
A. 对
B. 错
______with the size of the whole earth,the highest mountain does not seemhigh at all.(1990.1.CET-4)
A. When compared
B. Compare
C. While compared
D. Comparing
In reading stories we anticipate what is to come ______on our memory of whathas gone before.(1995.1.CET-6)
A. Based
B.basing
C. to base
D. to be based