在2003年首次全国人才工作会议上，胡锦涛要求树立科学人才观强调哪“三个观念”？
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To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to （）.
A. re-adjust the discharge pressure
B. clean the expansion valve screen
C. add refrigerant
D. adjust the expansion valve
Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）
A. Stationary
B. Full floating
C. Semi-floating
D. Free rolling
根据《绿色建筑评价标准》规定，就地取材是指材料场地距离施工现场（）km范围内。
A. 200
B. 300
C. 400
D. 500
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