使用过滤式自救器注意哪些事项？

______by Columbus in 1492,the island, or at least the western part of it now known as Haiti, was the scene of some of the most advanced political developments in the western world_________the eighteenth century, whose success_________the labor of half a million slaves

A．Discovered ; well in; rested on

B．Discovered; late; relying on

C．Discovering; well in; counting on

D．Discovering; lately ;depends on

肝病时，升高的是

A．LDH₁

B．LDH₂

C．LDH₃

D．LDH₄

E．LDH₅

认真细致的观察和分析实验现象，有助于获得化学知识并学会科学探究的方法。以下分析你认为合理的是