杭州交通信息网分析化学第六版上册:英语题22~~~
来源：百度文库 编辑：杭州交通信息网 时间：2024/04/28 16:19:06
I little understood the pressure __________ her.
A。on
B。in
C。at
D。against
A。on
B。in
C。at
D。against
A
D。against
Gauging Blood Pressure
Normal resting blood pressure in apparently healthy individuals averages 120/80 mmHg. The first number, 120, represents the pressure against the artery walls when the heart contracts (systolic blood pressure). The second number, 80, is the pressure against the artery walls during the resting phase (between heart beats) and is termed diastolic blood pressure. The difference between these two pressures, the Mean Arterial Pressure, or MAP, represents the average blood pressure throughout the arterial system.
应该是ON吧
on
on