Water vapor in the air cools and changes back into liquid water. This is ___. A. evaporation B. condensation C. precipitation D. infiltration 相关知识点: 试题来源: 解析 B。解析:空气中的水汽冷却并变回液态水的过程是凝结(condensation)。蒸发(evaporation)是液态水变为气态水的过程。降水(precipita...
When it comes to understanding clouds, it helps to understand water first. The water we drink is liquid (液态的) water. Ice is solid water. Water also exists (存在) as a gas. It’s called water vapor (水蒸气). Water vapor is found in the air we breathe. When it’s warm and ther...
There is a lot of water vapor in the air. It can turn into rain or snow. This is called ___. A. evaporation B. condensation C. precipitation D. sublimation 相关知识点: 试题来源: 解析 B。本题考查科学现象的英语表达。“condensation”意为“冷凝”,水蒸汽变成雨或雪是冷凝现象。选项 A“e...
Which one is a form of water vapor that condenses in the air near the ground? A. fog B. wind C. dew D. frost 相关知识点: 试题来源: 解析 A。解析:fog是雾,雾是水汽在靠近地面的空气中凝结的一种形式;wind是风,不是水汽凝结形式;dew是露水,是在物体表面的凝结;frost是霜,是冰晶形式,不是...
Rain is formed when water vapor in the air ___. A. evaporates B. precipitates C. transpires D. sublimates 相关知识点: 试题来源: 解析 B。解析:当空气中的水蒸气凝结并以液态或固态形式落下时就形成了雨,这个过程叫做降水(precipitates)。A选项evaporates是蒸发,C选项transpires是植物的蒸腾作用,D...
At the ___, water vapor in the air will turn into liquid. A. freezing point B. dew point C. boiling point D. heating point 相关知识点: 试题来源: 解析 B。解析:dew point是露点,在露点时,空气中的水蒸气会变成液体。A选项freezing point是冰点,和水蒸气变成液体无关。C选项boiling point是...
Clouds are formed when water vapor in the air ___. A. cools down and condenses B. heats up and evaporates C. moves quickly and spreads D. stays still and disappears 相关知识点: 试题来源: 解析 A。解析:本题考查云形成的关键过程。A选项“cools down and condenses”(冷却并凝结),云的形成...
Which of the following can increase the amount of water vapor in the air? A. Cooling B. Heating C. Freezing D. Condensing 相关知识点: 试题来源: 解析 B。解析:加热(Heating)可以增加空气中水汽的量。因为加热会使液态水更容易蒸发变成水汽。冷却(Cooling)会使水汽凝结而减少水汽量。冻结(Freezing)是...
百度试题 结果1 题目Water vapor in the air changes into water drops on the surfaces of these objects.空气中的水蒸气变成小水滴附着在这些物体表面。 相关知识点: 试题来源: 解析 答案:空气中的水蒸气变成小水滴附着在这些物体表面。反馈 收藏
百度试题 结果1 题目Clouds are formed when water vapor in the air ___. A. condenses B. evaporates C. precipitates 相关知识点: 试题来源: 解析 A。云是当空气中的水蒸气冷凝(condenses)时形成的。反馈 收藏