食管腐蚀伤一般表现为吞咽疼痛、吞咽困难等急性期的症状,这些症状一般持续()
A.1~3天
B.4~7天
C.1~2周
D.2~3周
E.1~2月
参考答案:C
腰椎穿刺时,病理性出血和损伤性出血的鉴别方法可采用____________法。
128. Their voices __________ to a whisper and I didn’t know what they were talking about.
A.became
B.had
C.felt
D.Fell