Heat the test tube further, and a yellow gas will be seen to escape into the air.

将试管进一步加热，就可以看到有一种黄色的气体逸到空气中。

youdao

Heat the test tube further, and a yellow gas will be seen to escape into the air.

将试管进一步加热，就可以看到有一种黄色的气体逸到空气中。

youdao