选择潜油电泵时对井液粘度有何要求?
参考答案:
含水低时,井液的粘度相对较高,与流道摩擦力大。因此,要求井液粘度在0.4帕²秒以下时,方可下电泵。
—He has got ________ idea. He lets his sister go with him.
—That's ________ good idea. [ ]
A. a; an
B. a; a
C. an; a
D. an; an
应用天王补心丹的辨证要点是()
A.失眠,惊悸,舌红苔黄,脉细数
B.失眠心悸,手足心热,舌红少苔,脉细数
C.虚烦失眠,咽干口燥,舌红,脉弦细
D.精神恍惚,悲伤欲哭,舌红苔少,脉细
E.心悸失眠,体倦食少,舌淡,脉细弱