词汇与结构
Warm air is less dense than cool air, and _____ air is less dense than dry air.
Warm air is less dense than cool air, and _____ air is less dense than dry air.
举一反三
- The air is less dense on a hot humid day than a cool dry day.
- A light(轻的) gas, such as hydrogen(氢), is much less dense(稠的) than air is at the same pressure.
- The pressure of pilot air is usually （） than that of starting air.
- The air leakage of tubular air preheater is larger than that of rotary air preheater (). A: Right B: Wrong
- The freight rate of air express is much higher than that of other air transportation mode.