相同体积、相同pH的某一元强酸溶液①和某一元弱酸溶液②分别与足量的锌粉发生反应,下列关于氢气体积(V)随时间(t)变化的示意图正确的是( )
A.
B.
C.
D.
答案:C
—We________gas.I'm afraid we can't go much further.
—I know there's a gas station ahead.Sure it will last us until we get there.
A.are running out
B.have run out
C.are running out of
D.have run out of
细胞内代谢产物生成的几种形式