问题
不定项选择
关于地球同步通讯卫星，下列说法中正确的是[ ]
A．它一定在赤道上空运行
B．各国发射的这种卫星轨道半径都一样
C．它运行的线速度一定小于第一宇宙速度
D．它运行的线速度介于第一和第二宇宙速度之间
答案
ABC
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关于地球同步通讯卫星，下列说法中正确的是[ ]
A．它一定在赤道上空运行
B．各国发射的这种卫星轨道半径都一样
C．它运行的线速度一定小于第一宇宙速度
D．它运行的线速度介于第一和第二宇宙速度之间
ABC
| 用方框中所给单词完成句子。 | |
| |
| 1. We can't go to the concert without a____. 2. He's a real football____so is his father. 3. It's ____ windy today, isn't it? 4. Li Lei doesn't like thrillers, but he likes ____. 5. —How much did that shirt____? —Thirty yuan. 6. Friday night's game on TV was ____.I love it. 7. Mr Smith can make English a lot ____ to learn. 8. The bus is always late because the ____ is always so busy. 9. Do you enjoy ____ my family this afternoon? 10. The boy in a black coat is my____. |