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【单选题】
关于成牙本质细胞描述哪项是正确的A.
成牙本质细胞是一种“终止细胞”
B.
成牙本质细胞经刺激后可分化为成纤维细胞
C.
成牙本质细胞经刺激后也可分化为成骨细胞
D.
成牙本质细胞经刺激后还可分化为巨噬细胞
E.
以上都对
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【单选题】急性颅内压增高时病人早期生命体征改变为
A.
血压升高，脉搏变缓，呼吸减慢
B.
血压升高，脉搏增快，呼吸减慢
C.
血压降低，脉搏变缓，呼吸减慢
D.
血压降低，脉搏增快，呼吸减慢
【单选题】Statistics over four consecutive years showed that four percent more automobile accidents happened in California during the week following the switch to daylight saving time and during the week follow...
A.
Drivers in California as well as those in the rest of the United States have similar driving patterns.
B.
The observed increases in accident rates are due almost entirely to an increase in the number of minor accidents.
C.
Four years is not a sufficiently long period of time over which to judge the phenomenon described.
D.
There are no other factors such as school vacations or holiday celebrations that cause accident rates to rise during these weeks.
E.
A time change at any other time of year would not produce a similar increase in accident rates.
【单选题】急性颅内压增高时病人早期生命体征改变为
A.
血压升高，脉搏变缓，脉压变小
B.
血压升高，脉搏增快，脉压增大
C.
血压降低，脉搏变缓，脉压变小
D.
血压降低，脉搏增快，脉压变小
E.
血压升高，脉搏变缓，脉压增大
【单选题】急性颅内压增高时病人早期生命体征改变为
A.
血压升高,脉搏变缓,脉压变小
B.
血压升高,脉搏变缓,脉压增大
C.
血压降低,脉搏变缓,脉压变小
D.
血压降低,脉搏增快,脉压变小
【单选题】关于消化道平滑肌的生理特性说法错误的是
A.
收缩缓慢，兴奋性低，富有伸展性
B.
对化学 、 温度 、 机械牵拉 刺激不敏感，对切割、电刺激敏感
C.
具有紧张性
D.
具有节律性
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