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【判断题】
质点系动量守恒的条件是质点系所受的合外力为零,与质点系是否存在内力以及内力的大小和方向无关; 机械能守恒的条件是质点系的外力和非保守内力不做功,或外力和非保守内力对质点系做功的代数和为零。A.
正确
B.
错误
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【单选题】How is a blended family formed?
A.
A blended family is formed by two single-parent families.
B.
A blended family is formed by a nuclear family and a grandparent．
C.
A blended family is formed by a nuclear family and grandparents．
D.
A blended family is formed by two fatherless families.
【简答题】A word formed by derivation is called a______, and a word formed by compounding is called a______.
【单选题】根据桩基工程勘探点间距的规定，对端承桩和摩擦桩的勘探点间距分别要求为
A.
15m、130m
B.
12∽24m、130m
C.
125m、20∽35m
D.
12∽24m、20∽35m
【单选题】Why Meg let Jo keep her back out of sight?
A.
because Jo was shy
B.
becaue Jo had no ribbon
C.
there had burn and tear on the back of Jo's pop
D.
Jo loved to sit still
【单选题】根据桩基工程勘探点间距的规定,对端承桩和摩擦桩的勘探点间距分别要求为( )
A.
10 ∽ 15m; 15 ∽ 30m;
B.
12 ∽ 24m; 15 ∽ 30m;
C.
15 ∽ 25m; 20 ∽ 35m;
D.
12 ∽ 24m; 20 ∽ 35m.
【单选题】According to the lecture, how are the individual stars formed?
A.
They are formed in isolation.
B.
They originate from the sun.
C.
They derive from gas clouds.
D.
They result from outer space energy.
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