问题
选择题
某交流电电源电压的瞬时值表达式为u=6 sinl00πt（V），则下列说法中正确的是（ ）A．用交流电压表测该电源电压时，示数是6V B．用交流电压表测该电源电压时，示数是6 C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁 |
V
答案
答案：A
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| 某交流电电源电压的瞬时值表达式为u=6sinl00πt（V），则下列说法中正确的是（ ） A．用交流电压表测该电源电压时，示数是6V B．用交流电压表测该电源电压时，示数是6 C．用此电源给电磁打点计时器供电时，打点的时间间隔为0.01s D．把标有“6V 3W”的小灯泡接在该电源上时，小灯泡将被烧毁 |
答案：A
| 完形填空 根据短文大意，从各题所给的选项中选择可以填入空白处的最佳选项。将其代号填入题前括号内。 | |||
| The great ship, the Titanic, sailed for New York from England on April 12th, 1912. The ship had sixteen watertight compartments (密封舱). Even if two of them were broken, she would 1 be able to stay on the water. Four days after 2 , while the Titanic was sailing 3 the icy waters of the North Atlantic, a huge ice mountain suddenly appeared. The great ship turned hard. The Titanic turned just in time, and just missed the big 4 of ice beside her. Suddenly there was a trembling (颤抖的) 5 from below and the captain went down to see what had 6 . The noise had been so weak that 7 thought the ship had been broken. But the captain 8 that the ship was sinking (下沉) very quickly, for five of the sixteen watertight compartments had already been broken! The order (命令) to 9 the ship was given and hundreds of people jumped into the icy water. As there were not enough lifeboats for everybody, 1,500 lives were 10 . Although the sad story has been so many years, people still remember it clearly. | |||
| ( )1. A. not ( )2. A. breaking ( )3. A. through ( )4. A. wall ( )5. A. voice ( )6. A. received ( )7. A. everyone ( )8. A. realized ( )9. A. keep ( )10. A. lived | B. yet B. finding B. above B. ground B. sound B. stopped B. anyone B. remembered B. leave B. saved | C. never C. starting C. across C. window C. shout C. happened C. nobody C. asked C. buy C. lost | D. still D. turning D. under D. door D. cry D. left D. anybody D. forgot D. sell D. found |