正常成人的脑灌注压为()
A.75~100mmHg
B.50~60mmHg
C.100~115mmHg
D.30~70mmHg
E.110~140mmHg
参考答案:A
Although the wind has________,the rain remains steady,so you still need a raincoat.[ ]
A.turned up
B.gone back
C.died down
D.blown out
当汽轮机主汽门关闭,或发电机油开关跳闸时,自动关闭抽汽逆止门,同时打开凝结水再循环门。