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【单选题】
According to the passage, we know that ______.A.
the earliest men in different places developed differently
B.
Eskimos' black skin is helpful to protect them from cold
C.
People in Africa have flatter faces than people in other areas
D.
the earliest men have the same foreheads and brains as men today
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举一反三
【单选题】I knew I could not finish my homework
A.
by he had come
B.
until he came
C.
when he comes
D.
before he comes
【简答题】两水相系统实际上为三元系统,其形成的条件和定量关系可用( )来表示。
【单选题】---Is there any _______ to the time about how long I can stay here? ---Yes, you must leave here before he comes back.
A.
number
B.
length
C.
limit
D.
matter
【简答题】One day an old man is selling a big elephant. A young man comes to the elephant and begins to look at it slowly. The old man goes up to him and says in his ear, “ Don’t say anything about the elephant...
【单选题】设系统由 n 个物体组成,其中 n 1 个物体受平面任意力系作用, n 2 个物体受平汇交力系作用, n 3 个物体受平面平行力系作用, n 4 个物体受平面力偶力系作用 。则系统能够列出的独立的平衡方程的最大数目 K 为 ( )。
A.
n 1 +n 2 +n 3 +n 4
B.
2n
C.
3n 1 +2n 2 +2n 3 +n 4
D.
3n
【简答题】有一字符串,包含n个字符。写一个函数,将此字符串从第 m个字符开始的全部字符复制成为另一个字符串。
【简答题】有一字符串,包含n个字符。写一函数,将此字符串中从第m个字符开始的全部字符复制成为另一个字符串
【单选题】由n个刚体组成的平衡系统,其中有n1个刚体收到平面力偶系作用,n2个刚体受平面共点力系作用,n3个刚体受到平面平行力系作用,其余刚体受平面任意力系作用,则该系统所能列出的独立平衡方程的最大总数是
A.
3n
B.
3n-n1-n2-n3
C.
3n-2n1-n2-n3
D.
3n-2n1-2n2-n3
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