用力呼气末()
A.胸内负压绝对值最大
B.胸内负压绝对值最小
C.胸内压值为0
D.胸内压值为正值
E.胸内压值无法测定
参考答案:B
对可能受到病原微生物污染的场所和物品进行的消毒为()
A.疫源地消毒
B.预防性消毒
C.随时消毒
D.终末消毒
E.环境消毒
Flowers suddenly burst out everywhere on the same day every spring, as if they in tune with one another.
A.are
B.were
C.have been
D.are to be