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【单选题】
2岁半的豆豆还不会自己吃饭，可偏要自己吃；不会穿衣，偏要自己穿。这反映了幼儿( )。A.
情绪的发展
B.
动作的发展
C.
自我意识的发展
D.
认知的发展
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举一反三
【单选题】Which of the following is true of perfectly competitive firms?
A.
It is difficult for entrepreneurs to become suppliers of a product in a perfectly competitive market structure.
B.
A perfectly competitive firm has a perfectly elastic supply curve.
C.
In a perfectly competitive market, an individual seller can change his price and it will not alter the output he sells.
D.
None of the above are true.
【单选题】The perfectly competitive firm faces a demand curve that is ________ and ________:
A.
perfectly inelastic; vertical
B.
perfectly elastic; horizontal
C.
unitary elastic; slopping downward
D.
the same as the market demand for the product; vertical
【简答题】A．typically B．simply C．fairly D．perfectly
【单选题】A perfectly competitive firm faces a demand curve that is:
A.
horizontal and perfectly inelastic.
B.
horizontal and perfectly elastic.
C.
vertical and perfectly inelastic.
D.
vertical and perfectly elastic.
【单选题】The demand curve facing a perfectly competitive firm is:
A.
perfectly inelastic.
B.
perfectly elastic.
C.
unit elastic.
D.
downward sloping.
【单选题】若堆栈采用顺序存储结构，正常情况下，删除堆栈中一个元素，栈顶指针TOP的变化是(44)。
A.
不变
B.
TOP=0
C.
TOP=TOP+1
D.
TOP=TOP-1
【简答题】四、计算题 1. 根据下列水准路线测量结果,填表并求出B点高程(要求有校核计算)。 测点 后视读数 前视读数 高差 高程 备注 + - A 1 2 3 4 B ∑ 校核计算
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