【单选题】n阶有向图G= 是强连通图,当且仅当()
【判断题】有向图D是单向连通的当且仅当D有一条生成通道。
【简答题】判断句子正误,正确的用“T”表示,错误的用“F”表示。 ( ) 1. She wears a yellow T-shirt. ( ) 2. We are staying at the Holiday Hotel. ( ) 3. What is the weather there ? ( ) 4. What are you going to do there ? ( ...
【简答题】判断句子正误,正确的用“T”表示,错误的用“F”表示。 ( ) 1. We are going have a football match. ( ) 2. My mother is going to washed clothes. ( ) 3. You look sad today. ( ) 4. He passes it to Mike. ( )...
【简答题】根据短文内容,判断下列句子的正误,正确的用“T”,错误的用“F'。 Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow food. They are learning a lot. ab...
【简答题】根据短文内容,判断下列句子的正误,正确的用“T”,错误的用“F”。 It takes only 30 seconds to finish the journey in the South Pole. Visitors to the South Pole like to walk around, so there is a clear path in the snow there. Some vis...
【简答题】判断正误,正确的用“T”表示,错误的用“F”表示。 ( ) 1. In Monday we saw elephants. ( ) 2. Yesterday we bought presents. ( ) 3. Now we are climbing a mountain. ( ) 4. She listened music last weekend. ( )...
【简答题】阅读理解,判断正误,正确的用“T”表示,错误的用“F”表示。 Mr Brown looks out of the window. There is a boy in the street. He is eating a sandwich. There is a dog in the street, too. The boy says, ' Come here, good dog. I am goi...