题目内容
(请给出正确答案)
[单选题]
A.A—T B.A—U C.C—U D.A—C E.A—G
A.A—T
B.A—U
C.C—U
D.A—C
E.A—G
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A.A—T
B.A—U
C.C—U
D.A—C
E.A—G
下列碱基对中,氢键数目正确的是()。
A.A=T,G=C
B.A=T,G≡C
C.A≡T,G≡C
D.A≡T,G=C
E.A≡U,G≡C
若有以下语句,则正确的描述是
char a[]="toyou";
char b[]={′t′,′o′,′y′,′o′,′u′};
A.a数组和b数组的长度相同
B.a数组长度小于b数组长度
C.a数组长度大于b数组长度
D.a数组等价于b数组
A.a and b
B.a and c
C.c and d
D.b and d
B.a,b两点线速度相同
C.c点的线速度大小是a点线速度大小的一半
D.a、b、c三点的运动周期不相同
He admitted, with______, that he didn't understand a word of the speech.
A.a puzzling frown
B.a puzzled frown
C.a frown puzzling
D.a frown puzzled
The passage tells us that there is ______.
A.a central library in each area
B.a library in the center of each area
C.one central library for all areas
D.more than one central library in each area