A toddler with croup is given a vaponefrin updraft because of increasing respiratory distress. The nurse evaluates the treatment as being effective when see which of the following（）

A. The child’s color is normal.

B. The child’s retractions are less severe.

C. The child’s heart rate is 100 bpm.

D. The child’s pulse oximeter reads 90.

在（）的接触网下，不准在敞车、平车、罐车等车辆（棚车、保温车、家畜车内除外）上进行装卸作业。