阻塞性肺气肿的肺功能可出现()
A.肺活量减少
B.残气及肺总量增大
C.FEV下降
D.肺弥散功能减低
E.残气/肺总量比值大于40%
参考答案:A, B, C, D, E
Fire extinguishers on inspected vessels are numbered by size I through V,with I being().
A.used for electrical fires only
B.the smallest
C.the most accessible
D.the most effective
电压表应并联于被测电路,测正弦电压应使用交流电压表。