打开层门时必须要做的事项有().
A.双脚与肩宽站稳
B.防止外人干扰
C.有三角钥匙将门开不大于100mm
D.确认轿厢位置
参考答案:A, B, C, D
诊断慢性支气管炎的主要依据是()
A.病史
B.阳性体征
C.胸部X线检查
D.心电图改变
E.肺功能检查
Pain is now considered the fifth _____sign, as important as blood pressure, temperature , breathing rate and pulse in determining a person’s health.
A.original
B.vital
C.unique
D.vivid