什么叫管网中的最不利点？
参考答案：
管网中最高或最远处压力最低的点。
Einstein was __ a great scientist. He did a lot for human rights and progress.
A．no more than
B．not more than
C．more than
D．as much as
莱姆病患者关节液中可检测到细胞因子是（）。
A.IL-1
B.HLA-DR3
C.IL-2
D.HLA-DR2
E.HLA-DR4
