题目内容
在根树中,若结点a到结点b有边,a到c也有边,则b是c的____。
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设R1,R2是集合A={a,b,c,d}上的两个关系,其中R1={(a,b),(b,c),(d,d)},R2={(a,b),(b,a),(b,c),(c,b),(d,d)},则R2是R1的_____闭包。
以下语句中_____不是命题.
已知无向树T,则T不具有的性质是。
If you __________ (1) find out what it is like __________ (2) the tropical jungle, you should make a trip on the river. This is better than walking through the trails in the forest, as these are often blocked by undergrowth that gets __________ (3) in your feet and makes traveling difficult. In a dugout canoe, you can sit back and enjoy the scenery while the guide __________ (4) it along the rivers that __________ (5) their way through the forest. Everywhere you go, you can hear the clatter of birds, hidden __________ (6), deep in the jungle. At other times, they are clearly visible, circling __________ (7) overhead. And you can also see some of them __________ (8) about in the clearings and others __________ (9) on the __________ (10) waters. But birds are not the only wildlife. From time to time, you can spot enormous black fish __________ (11) about in shallow water. Or if you look closely enough, you can see some small animals __________ (12) in and out of the bushes. Indeed, the whole jungle __________ (13) with a huge variety of animal life, guaranteed to make your trip a __________ (14) event that you will never forget.
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