对高血压突发支气管哮喘应选用
A.异丙肾上腺素
B.肾上腺素
C.氯茶碱
D.地塞米松
E.色甘酸钠
参考答案:A
Everyone is here _____ Li Lei, because he is ill in hospital.
A.with
B.besides
C.except
D.but
离心泵的能量损失有几种?