胶带运输机的驱动装置布置有哪些类型?
参考答案:
胶带运输机的驱动装置布置有头部驱动、头尾驱动、多驱动三种类型。
He made another wonderful discovery, _______ of great importance to science.
A.which I think is
B.which I think it
C.which I think it is
D.I think which is
(1)写出乙酸与乙醇在浓硫酸、加热条件下发生酯化反应的化学方程式 ▲
(2)写出SO2通入足量NaOH溶液中反应的离子方程式 ▲