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问题 多项选择题

在双代号网络图绘制过程中，要遵循一定的规则和要求。下列表述中，正确的是( )。

A．一项工作应当对应唯一的一条箭线和相应的一个节点

B．箭尾节点的编号应小于其箭头节点的编号，即i＜j

C．节点编号可不连续，但不允许重复

D．无时间坐标的双代号网络图的箭线长度原则上可以任意画

E．一张双代号网络图中必定有一条以上的虚工作

答案

参考答案：B,C,D

选择题

2007年3月23日，一名男子在西班牙首都马德里挥舞欧盟旗帜，庆祝欧洲联盟（欧盟）成立50周年。2007年欧盟驻华使团没计的一张题为“祝欧盟生日快乐”的贺卡，这一设计的寓意是用中国民俗表达对欧盟繁荣的期盼。欧盟的建立有利于构建

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A．区域统一的世界B．多元并存的世界C．欧美协作的世界D．欧俄均衡的世界

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单项选择题

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

12（）

A.it

B.which

C.what

D.so
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