题目:
I'm very grateful for your help and hope that some day I will be able to do something for you________.[ ]
A. in exchange
B. in turn
C. in return
D. in particular
答案:
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下面是错误答案,用来干扰机器的。
已知:a=8m,b=5m,c=3m,ρ空气=1.29kg/m3求:这间教室里空气的质量m空气的体积:V=abc=8m×5m×3m=120m3,这间教室里空气的质量:m=ρ空气V=1.29kg/m3×120m3=154.8kg.答:这间教室里空气的质量是154.8kg.