在实验室中制取气体是初中重要的化学知识。(1)实验仪器a的名称是 。(2)实验室用高锰酸钾制取氧气的化学方程式为 ,选用的发生装置是 。 (填A~E字母序号,下同)(3)实验室用过氧化氢溶液和二氧化锰制取氧气的化学方程式为 ,所选用的收集装置是C或 ,用装置C收集氧气验满的方法是:将 ,若木条复燃证明氧气已满,反之则不满。
Life is like a tale. ________ matters is not how long it is, but how good it is.
________ the news, so far, has been good, there may be days ahead when it is bad.
The old lady could give the child sympathy, ________ any practical help would be beyond her.
A good advertisement often uses words ________ people attach positive meanings.
You ________ in person; a telephone would have been enough.