第13题: [单项选择]Exhaust pipes for separate diesel engines can be combined only when () A. space limitations prevent separately run pipes B. the engines are small auxiliary units C. they are arranged to prevent gas backflow to each engine D. a waste heat boiler is installed 参考答案:C
第34题: [单项选择]生理性贫血时,红细胞和血红蛋白分别降至 A. 4.0×10(12)/L,120g/L B. 3.0×10(12)/L,110g/L C. 2.7×10(12)/L,90g/L D. 3.6×10(12)/L,110g/L E. 3.0×10(12)/L,100g/L 参考答案:E