急性心肌梗死发生心室颤动的先兆是
A．室性早搏频发成对多源B．室上性阵发性心动过速C．房性早搏D．房室传导阻滞Ⅱ度E．乙房纤颤
参考答案：A
— Hasn't the thief admitted his crime by now?
— No, ______ questioned many times. [ ]
A. if
B. though
C. unless
D. once
骨盆环骨折特有的临床表现是
A．疼痛广泛，坐位或行走时加重
B．局部肿胀、瘀斑、压痛显著
C．患侧肢体短缩
D．骨盆挤压、分离试验阳性
E．患侧髂后上棘较健侧高
