Dry air contains a very small amount of Xe
举一反三
- Only a minute amount is needed. What does minute mean in this context? A: any very short period of time B: very small C: 60 seconds D: precise or detailed
- 词汇与结构 Warm air is less dense than cool air, and _____ air is less dense than dry air.
- Between Lake Erie and Lake Ontario there is a "drop" of 99.4 meters. A: a distance down from a high point to a lower point B: a very small amount of liquid C: a fall or reduction in the amount D: gap
- The opposite of minor is A: very dry B: very important C: very dirty
- Which of the following is NOT the reason why small green plants are very important to dry places A: They keep the earth from becoming even drier. B: They do not let wind blow the earth away. C: They add color to the dry places. D: They hold water.