单项选择题

定时测量血压，可以帮助判断有无休克及程度，表示存在休克的是

A.收缩压＜90mmHg，脉压＜20mmHg
B.收缩压＜95mmHg，脉压＜20mmHg
C.收缩压＜100mmHg，脉压＜20mmHg
D.收缩压＜100mmHg，脉压＜30mmHg
E.收缩压＜95mmHg，脉压＜25mmHg
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