题目管饲时床头抬高的适宜角度为?()A. 15-20%B. 30-45%C. 60%D. 90%管饲时床头抬高的适宜角度为?()A. 15-20%B. 30-45%C. 60%D. 90%题目解答答案B. 30-45%