—Robert is to face dangers. Don't be worried about him.—I think so.

题干

—Robert is to face dangers. Don't be worried about him.

—I think so.

A：brave(勇敢的) enough

B：enough brave

C：braving

D：too brave

上一题下一题 0.0难度选择题更新时间:2019-04-20 08:41:17

A

选项	实验内容	实验目的
A	测同温同浓度下的Na₂CO₃和Na₂SO₃水溶液的pH	确定碳和硫两元素非金属性强弱
B	向CH₂=CHCH₂OH中滴加酸性KMnO₄溶液	证明CH₂=CHCH₂OH中含有碳碳双键
C	取久置的Na₂SO₃溶于水，加硝酸酸化的BaCl₂溶液	证明Na₂SO₃部分被氧化
D	向蔗糖溶液中加入几滴稀硫酸，水浴加热几分钟，然后加入足量稀NaOH溶液，再向其中加入新制的银氨溶液，并水浴加热	检验蔗糖水解产物具有还原性