下列哪一项有助于诊断蛛网膜下腔出血()
A.明显的意识障碍
B.脑膜刺激征
C.均匀一致血性脑脊液
D.突然发生剧烈头痛
E.起病急骤,情绪激动等因素为其诱因
参考答案:C
利用如图制作的实验装置可获得电流,根据其所揭示的原理制成的设备是:
A、电磁铁
B、电动机
C、发电机
D、电磁继电器
—What did the doctor say? —He asked how long _________.
A.has my daughter caught a cold
B.had my daughter caught a cold
C.my daughter had caught a cold
D.my daughter had had a cold