毛泽东思想和中国特色社会主义理论体系作为马克思主义中国化的两大理论成果，它们有着共同的“根”，这个“根”就是（）
A. 马克思列宁主义
B. 德国的古典哲学
C. 英国的古典政治经济学
D. 空想社会主义
查看答案
What is an advantage of using foam in fire fighting?（）
A. It is effective in controlling fire in flowing oil such as coming from a broken fuel line
B. It absorbs heat from materials that could cause reignition
C. Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment
D. Once the surface is blanketed with foam and the fire is extinguished，no further foam is required
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