(1分)一般来讲，机体失血通过神经体液调节，可代偿的维持血压于正常范围，但一次突然失血量不超过总血量的比值为（    ）· https://bgk-photo.cdn.bcebos.com/902397dda144ad34b630dcf8c0a20cf430ad85c6.jpg 
A: 10%· https://bgk-photo.cdn.bcebos.com/4a36acaf2edda3cc866be35f11e93901203f92c6.jpg 
B: 15%· https://bgk-photo.cdn.bcebos.com/9358d109b3de9c82f88ca2f07c81800a18d843e7.jpg 
C: 20%· https://bgk-photo.cdn.bcebos.com/d058ccbf6c81800a340cd271a13533fa838b47e7.jpg 
D: 25%· https://bgk-photo.cdn.bcebos.com/b03533fa828ba61e9b0793505134970a314e59e7.jpg 
E: 30%得分： 1