单项选择题
A.前臂放于胸前 B.前臂向上放于头侧 C.前臂向下放于身体两侧 D.上肢与身体平行
A.1小时B.2小时C.3小时D.4小时
A.1min,150-200mmHg B.2min,150-200mmHg C.3min,200-250mmHg D.4min,200-250mmHg