下列变化属于化学变化的是
A.石油的分馏
B.煤的干馏
C.煤的气化
D.煤的液化
BCD
The girl likes to buy cheap things. She often spends _________ money on _________ things.
A.more, fewer
B.fewer, more
C.less, more
D.more, less
尿毒症时下述哪些毒性物质在体内潴留()
A.甲状旁腺素(PTH)
B.胍类化合物
C.尿素
D.胺类
E.中分子毒性物质