水的气化热很大，1公斤的水在100度时变成同温度的蒸汽要吸收（）千焦的热量.
查看答案
The dew point is reached when the（）.
A. temperature of the air equals the temperature of the seawater
B. atmospheric pressure is 14.7 lbs. per square inch
C. relative humidity reaches 50%
D. air becomes saturated with water vapor
吹灰器应定期在操作室进行启动，减少故障率。
A. 正确
B. 错误
微信支付 
支付宝支付