问题
判断题
盒子里有4颗黑棋子和8颗白棋子，任意摸一颗，摸到黑棋子的可能性小。[ ]
答案
正确
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盒子里有4颗黑棋子和8颗白棋子，任意摸一颗，摸到黑棋子的可能性小。[ ]
正确
| 完形填空。 | ||||
| I have been seeing more and more patients who want to run away from city life, air pollution, and illnesses which they suspect (怀疑) 1 from polluted environments and bad food. One professional man, for example, 2 that he and his wife had moved to a suburban community and drove to work over the 3 20 years-they went to separate places and drove two cars. They were driving to a city 4 grew out to meet them. The population grew larger. When they started driving, his journey 5 less than 30 minutes; 20 years later, the trip each way had 60 minutes on average; sometimes,when the traffic 6 bad, they each 7 90 minutes or more in the car, one-way. Both had become progressively ill. Both decided they 8 to a small town and never drive again. The decision 9 drive one or more cars every day, long distances 10 may have been a common one 11 working people in North America in the last 40 years. Cities 12 larger. The development of suburbs often placed homes 13 work places; massive road construction encouraged people 14 cars. It was clear to this couple(夫妇) that 15 had been a terrible mistake and they should stop driving to work. | ||||
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如下是一个稀疏矩阵的三元组法存储表示和相关的叙述正确的是
| 行下标 | 列下标 | 值 |
| 1 | 2 | 5 |
| 1 | 3 | 2 |
| 2 | 7 | 9 |
| 3 | 5 | 6 |
| 3 | 6 | 1 |
| 4 | 6 | -1 |
| 5 | 4 | 3 |
A．该稀疏矩阵有8列
B．该稀疏矩阵有7列
C．该稀疏矩阵有9个非0元素
D．该稀疏矩阵的第3行第6列的值为0