沃森和克里提出的DNA。双螺旋结构模型每旋转一周的碱基对数
A.8
B.9
C.10
D.11
E.12
参考答案:C
We shouldn’t spend our money testing so many people, most of _____are healthy
A.that
B.which
C.what
D.whom
高层医院建筑,其首层每个疏散外门的净宽不应小于()。
A.1.10m
B.1.30m
C.1.50m
D.1.60m