问题
单项选择题
新装电容器的三相电容之间的差值应不超过一相的总电容量的（）。
A、1％
B、5％
C、10％
D、15％
答案
参考答案：B
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新装电容器的三相电容之间的差值应不超过一相的总电容量的（）。
A、1％
B、5％
C、10％
D、15％
参考答案：B
| 完形填空 | ||||
| Coffee has been a part of people's lives for thousands of years, and it is still one of the world's favorite 1 . Here is a story of coffee and 2 it was discovered. The story 3 us coffee was 4 in Africa long, long ago. One day a farmer was 5 his goats, and he saw them 6 some berries (咖啡豆) from a plant. The goats became very 7 after they ate the berries. The man often felt tired, 8 he decided to try the berries, too. To his great 9 , he didn't feel tired any more. Coffee plants were thus (因此) discovered. The coffee was taken from Africa to other 10 in Europe and America. After that farmers started to grow coffee plants especially in South America. | ||||
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