【单选题】He was so tired that as soon as he lay down he fell _______ asleep.
【简答题】利用得失电子守恒,配平下列方程式。 KMnO 4+ + HCl = KCl + MnCl 2+ + Cl 2 ↑+ H 2 O
【单选题】很多普通人被称为“辣妈”是从哪一年开始的?()
【单选题】He was so deep in thought,thinking of the problem ________ he knocked into the tree without noticing it.
【单选题】Before reassembling any machinery, you should _____.
A.
replace all bearings regardless of length of service
B.
apply a heavy coat of oil to all mating surfaces
C.
clean any corroded surfaces and file all burrs smooth
D.
coat all parts with alemite grease
【单选题】He earns a good salary, so he ____ be deep in debt.
【单选题】某基元反应A + B→D,此反应的级数为 。
【单选题】某基元反应 A + B → D ,此反应的级数为 。
【单选题】He is in deep sorrow, so it is not a(n) time to mention the subject.