皮皮学，免费搜题
登录
搜题
【简答题】
实验室选用图1所示装置制取和收集气体，根据要求回答下列问题． （1）指出标号的仪器名称①______②______． （2）用装置B制取氧气，反应的化学方程式：______，该装置还可用于制取的气体是______． （3）D实验中观察到的现象是：______，生成黑色固体，放出大量的热． （4）实验室常用加热无水醋酸钠和碱石灰混合固体的方法制取甲烷气体，发生装置可选择______（填序号）．甲烷气体一般采用装置C进行收集，收集集气瓶的放置图2所示，据此可推断甲烷一定具备的两点物理性质是：______、______．
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】It provides support in every area of national _______, contributing to Japan's national security through leading-edge technologies. (point / required / defense / assumed / wrestle)
【判断题】W riting creative stories is not an important skill for applying for a job.
A.
正确
B.
错误
【单选题】It provides support in every area of national _____ , contributing to the country's national security through leading-edge teachnologies.
A.
claims
B.
sources
C.
defense
D.
disciplines
【简答题】The trolley slides via roller bearings on the support bar. It also transfers forces from the mechanism to the leaf and vice versa. Furthermore, it provides parallelism between the carrier and the bar.
【单选题】The European Community says it will consider using force ______ is needed for peace keeping in the region.
A.
what
B.
that
C.
such
D.
so
【单选题】If something ______ an idea or point of view, it provides more evidence or support for it.
A.
creeps
B.
prioritises
C.
reinforces
D.
transmits
相关题目：
参考解析：
知识点：
题目纠错 0
发布
