20. I’ve never regretted the _______________ (decide).
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英译汉(请把下面的段落翻译成汉语。)33. There are many interesting activities on campus. They are organized by different student clubs. If interested, you can join them. It’s a good way to improve communication skills, to make friends and to enjoy you hobbies.
一个干燥系统使用的是湿度为H,流量为L (kg绝干气/h)的空气(送风机入口处),则湿空气的质量流量为:() 。
A. L*H
B. L/H
C. L(1-H)
D. L(1+H)
若绝干物料的比热容为Cs,水的比热容为Cw,物料的干基含水量为X,则物料的比热容cM()
A. cM=cS+(1+X)cW
B. cM=cS+XcW
C. cM=cS+(1-X)cW
D. cM=XcS+cW
一般来说,降低废气温度,则干燥器的热效率( )
A. 不变;
B. 降低;
C. 升高;
D. 无法确定。