H2和空气爆炸上限为()。
A、96%H2,4%Air
B、73.5%H2,26.5%Air
C、26.5%H2,73.5%Air
D、72.5H2,26.5%Air
参考答案:B
—— You seem to have learned all the English words by heart.
_____ .
A.So l do
B.So do l
C.So I have
D.So have I
门静脉的重要属支有______
A.附脐静脉
B.肝静脉
C.右卵巢静脉
D.脾静脉
E.肠系膜上静脉