凝汽器的汽阻主要决定于()。
A、冷却水管的排列;
B、蒸汽负荷;
C、冷却水量。
参考答案:A
Up to now,the program________thousands of children who would otherwise have died.
A.would save
B.saves
C.had saved
D.has saved
具有止咳化痰,降气平喘作用( )
A.桂龙咳喘宁B.二母宁嗽丸C.苏子降气丸D.百合固金丸E.通宣理肺九