皮皮学，免费搜题
登录
搜题
【单选题】
下列实验操作中有错误的是 ( )A.
分液时，分液漏斗下层液体从下口放出，上层液体从上口倒出
B.
萃取时，用酒精萃取碘水中的碘
C.
蒸馏时，冷却水应从冷凝管的下口通入，上口流出
D.
把几滴FeCl 3 饱和溶液滴入25mL的沸水中加热至液体呈红褐色，制取Fe(OH) 3 胶体
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】To ensure their sales, some tobacco companies stated that there was still '______' over the effects of cigarettes on health.
【单选题】_____to ensure that their claims are received on time, claimants are encouraged to file their claims electronically or by fax, utilizing the special procedures described in this notice.
A.
Whether
B.
In order
C.
According
D.
How
【单选题】Guo Yue did quite at the World Table Tennis Championship(锦标赛), but Zhang Yining did even .
A.
better, well
B.
well, well
C.
well, better
D.
bette better
【简答题】If we are to ensure that our children and grandchildren inherit a world that is not altered for the worse by global warming, we must begin____________. (采取措施减少全班干球气温上升所带来的污染总是)
相关题目：
参考解析：
知识点：
题目纠错 0
发布
