静息状态下,健康成年男子的心输出量范围是()
A.2~31/min
B.9~201/min
C.7~81/min
D.4~61/min
E.25~301/min
参考答案:D
预防腹部术后肠梗阻的有效护理措施是()
A.早期半卧位
B.早期下床活动
C.尽早进食、水
D.早期腹部按摩
E.早期腹部加压
I was really anxious about you. You _______ have left home without a word.
A.mustn't
B.shouldn't
C.needn't
D.couldn't