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
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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
人体体型美所包含的基本要素有()。
A. 均衡
B. 对称
C. 对比
D. 曲线
E. 重量
F. 三维