-- Is it to protect the earth against heavy pollution?-- No, I don't think so. If everybody takes ac

题干

-- Is it to protect the earth against heavy pollution?

-- No, I don't think so. If everybody takes actions now, it will become better.

A：useful

B：hopeless

C：dangerous

D：important

上一题下一题 0.0难度选择题更新时间:2012-07-09 10:06:25

B

查阅资料①锌皮为金属锌（含有少量的铁）

②黑色糊状填充物由炭黑、MnO₂、ZnCl₂和NH₄Cl等组成

③有关数据见下表

实验探究一小明取适量黑色糊状填充物，按如图2所示实验流程进行探究．