单独接触不致癌,在接触启动剂之后反复接触可增强启动剂致癌作用的是()
A.免疫抑制剂
B.启动剂
C.助癌剂
D.促长剂
E.过氧化物酶体增殖剂
参考答案:D
肺内压与肺回缩力之差为 ( )
A.表面活性物质B.胸膜腔内压C.肺内压D.弹性阻力E.顺应性
I haven't read()book, but I read half of it. At least I know something about the subject now
A.whole
B.the whole
C.all of
D.all