TAE-100A/30离心式压缩机在恒定压力控制下,压缩机处于最佳工作状况,入口阀全(),出口阀全()。
Although TCP segments differ from UDP segments, they both contain some common fields. What two segments do they share in common?()
A. source address
B. options
C. sequence number
D. sources
E. destination port
F. checksum
比转数高的泵,对应效率最高时的流量(),扬程(),因而叶轮的直径比D2/D1较(),D2/D1较()。
向一升0.1mol/LHA(pKA=5.0)溶液中加入2克固体氢氧化钠(M=40g/mol)后,溶液的pH值与哪一个最为接近()
A. 3.03.7
B. 5.0
C. 0.006mol/L
D. 6.3