燃烧下列混合气体,所产生的CO2的量一定小于燃烧相同质量的丙烯所产生的CO2 的量的是[ ]
A.丁烯、丙烯
B.乙炔、乙烯
C.乙炔、丙烷
D.乙烷、环丙烷(C3H6)
答案:D
一What did he want to know,John?
一 that we could finish our work.
A.What it was
B.When was it
C.When it was
D.What was it
崩漏的主要病机是()
A.阴虚火旺,经血失约
B.气虚不摄,经血失约
C.瘀血内阻,血不归经
D.冲任损伤,经血失约
E.阳盛血热,迫血妄行