以下哪项不是MS的特点（）
A.时间多发性
B.空间多发性
C.症状波动
D.缓解复发
E.白质病变
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What do the people usually do on weekends? Some people like to at home, but others like to go out for a walk or play football. Mr Smith hard in a factory during (在期间) the . On the weekends, he usually the same thing. On Saturday he washes his car and on he goes with his family to a village(村庄) by car. His uncle and aunt a farm there. It isn't a big one, but there is always to do on the farm. The children help with the animals and give them some . Mr and Mrs Smith help in the field(田地). At the end of the day, they are all and Mr Smith's aunt them a big meal.
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下图所示的实验能达到实验目的的是（ ）
A．验证质量守恒定律
B．测定空气中的氧气含量
C．证明CO2密度比空气大
D．证明CO2与水反应
初产妇，28岁，39周因规律宫缩伴阵发性胎动频繁5小时入院。检查：胎动及宫缩后胎心突然变慢。肛查：胎头高浮，宫口开大3cm，胎膜未破，估计胎儿体重3400～3500g，孕妇左侧卧位及抬高臀部时胎心迅速恢复正常，骨盆测量正常。
此时最可能的诊断是（）
A.脐带缠绕
B.脐带脱垂
C.脐带先露
D.脐带打结
E.脐带扭转
不由股神经支配的肌肉是 ()
A．缝匠肌
B．腹直肌
C．腹外侧肌
D．髂肌
E．长收肌
CD-ROM盘中的信息存储在 ______ 中。
A．内外圈磁盘
B．螺旋形光道
C．内外圈光道
D．螺旋形磁道