明代是四唐分期说的定型时期,代表论著是()。
参考答案:《唐诗品汇》
Her question was so difficult that I could hardly make any ________ of it at all. [ ]
A. explanation
B. meaning
C. sense
D. idea
高强度紫外线消毒灯要求()。
A.功率>30W灯,≥90μW/cm2
B.功率30W灯,>180μW/cm2
C.臭氧产量<1mg/h
D.臭氧产量>25mg/h
E.功率30W灯,>160μW/cm2