问题
问答题 简答题
什么是混合式凝汽器？什么是表面式凝汽器？
答案
参考答案：
汽轮机的排汽与冷却水直接混合换热的叫混合式凝汽器。这种凝汽器的缺点是凝结水不能回收，一般应用于地热电站。
汽轮机排汽与冷却水通过铜管表面进行间接换热的凝汽器叫表面式凝汽器。现在一般电厂都是表面式凝汽器。
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什么是混合式凝汽器？什么是表面式凝汽器？
参考答案：
汽轮机的排汽与冷却水直接混合换热的叫混合式凝汽器。这种凝汽器的缺点是凝结水不能回收，一般应用于地热电站。
汽轮机排汽与冷却水通过铜管表面进行间接换热的凝汽器叫表面式凝汽器。现在一般电厂都是表面式凝汽器。
| 阅读理解。 |
 Dolphins are mammals, not fish. They are warm blooded like man, and give birth to one baby, called a calf, at a time. At birth, a bottlenose dolphin calf is about 90-130 cms long and will grow to approximately 4 metres, living up to 40 years. They are highly sociable animals, living in groups, called pods, which are fairly fluid, with dolphins from other pods interacting with each other from time to time. Dolphins carry their young inside their womb for about 12 months. The baby is born tail first, and its mother will feed the calf for up to 2 years. However, the calf will stay with its mother for between 3-6 years, during which time it will learn all about feeding techniques, social interaction and group hunting. |
| 1. What is a baby dolphin called? |
[ ] |
| A. A pod B. A baby C. A womb D. A calf |
| 2. How long does a dolphin calf stay with its mother? |
[ ] |
| A. 12 months B. 2 years C. 3-6 years D. 40 years |
| 3. What kind of blood does a Dolphin have? |
[ ] |
| A. warm-blood B. cold-blood C. salt-water blood D. we don't know |
| 4. Which statement is Wrong? |
[ ] |
| A. Dolphins are living in groups. B. Dolphins lay eggs. C. Dolphins can live up to 40 years. D. Dolphins are not fish. |