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【单选题】
以下不属于网络拓结构的是
A.
广域网 解析:网络拓扑结构有结构、环型结构、总
B.
星形网 线结构、分布式结构、结构、网状结
C.
总线结构 构、蜂窝状结构等。
D.
环形网
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举一反三
【单选题】侧链含有-SH的氨基酸是()。
A.
Gly
B.
Ser
C.
Phe
D.
Cys
【单选题】某二叉树的前序遍历序列为 ABCDE ,中序遍历序列为 CBADE ,则后序遍历序列为
A.
CBADE
B.
EDCBA
C.
EDABC
D.
CBEDA
【简答题】侧链含有- OH 的氨基酸有 、 和 ,侧链含有- SH 的氨酸有 和 。
【单选题】—The earth goes round the sun. —What did he say? I couldn't hear him. —_________. [     ]
A.
He says the earth goes round the sun.
B.
He said the earth goes round the sun.
C.
He said the earth went round the sun.
D.
He says the earth went round the sun.
【简答题】如图,抛物线y=x 2 +bx+c过点A(﹣4,﹣3),与y轴交于点B,对称轴是x=﹣3,请解答下列问题: (1)求抛物线的解析式. (2)若和x轴平行的直线与抛物线交于C,D两点,点C在对称轴左侧,且CD=8,求△BCD的面积. 注:抛物线y=ax 2 +bx+c(a≠0)的对称轴是 .
【简答题】如图,抛物线y=x 2 +bx+c过点A(-4,-3),与y轴交于点B,对称轴是x=-3,请解答下列问题: (1)求抛物线的解析式. (2)若和x轴平行的直线与抛物线交于C,D两点,点C在对称轴左侧,且CD=8,求△BCD的面积. 注:抛物线y=ax 2 +bx+c(a≠0)的对称轴是x=- b 2a .
【单选题】He said _________________________________________.
A.
that the earth goes around the sun .
B.
that the sun goes around the earth .
C.
that the sun went around the earth .
D.
that the earth went around the sun .
【简答题】A.He is down-to-earth. B.He is aggressive and optimistic. C.He is discouraged by his failure. D.He is confident about achieving a real first.
【单选题】48某二叉树的前序遍历序列为ABCDE,中序遍历序列为CBADE,则后序遍历序列为
A.
EDCBA
B.
EDABC
C.
CBEDA
D.
CBADE
【简答题】The lover of nature is he whose intercourse with heaven and earth becomes ______.
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