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【单选题】
设图G＝A.
deg( V )=2 ½ E ½
B.
deg( V )= ½ E ½
C.
∑ deg( V )=2 ½ E ½
D.
∑ deg( V )= ½ E ½
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反馈参考答案：
举一反三
【单选题】If a good is subject to the free-rider problem and an inefficiently low level of production when left to the private market, the good must be a(n):
A.
private good.
B.
public good.
C.
common resource.
D.
artificially scarce good.
【单选题】铺筑高速公路及一级公路沥青混合料时，一台摊铺机的铺筑宽度不宜超过6m(双车道)- 7.5m(3车道以上)，两幅之间应有( )mm宽度的搭接，上下层的搭接位置宜错开200mm以上。
A.
40～60
B.
40～80
C.
30～60
【简答题】Taking pictures is fun, and taking good ones is not difficult if you follow a few rules. Before you snap ( 快拍 )a picture, thinking about it. Be sure that you are close enough to your subject. A...
【简答题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered. Taking pictures is fun, and taking good ones is not difficult if you follow a few rule...
【多选题】轻度精神发育迟滞的诊断标准包括
A.
智商在35~40至50~55之间
B.
学习成绩差，时常不及格或留级
C.
只能完成较简单的手工劳动
D.
生活能自理
E.
无明显言语障碍
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