下列情况中,最应采取急诊手术治疗的是()
A.盆腔感染所致的腹膜炎
B.败血症继发腹膜炎
C.阑尾穿孔后,阑尾周围脓肿形成
D.急性腹膜炎无局限趋势而原因不明者
参考答案:D
22._____trying to persuade his father to give up smoking, his letter was rejected.
A.Aiming at
B.Aimed at
C.Being aimed at
D.to aim at
授予发明和实用新型专利权的条件包括()。
A.新颖性
B.保密性
C.实用性
D.富有美感
E.创造性