（注：SiCl4的沸点是57.6ºC，金属氯化物的沸点均高于150ºC）
解方程．
1
Dear guest,
We want to do our best to help with the environmental protection, but we do provide washing things (toothbrush, toothpaste, bath shampoo, etc.)
If you forget to bring any of these with you, just dial 9 and call the guestroom department. If you wish, we shall send you what you need for free.
2
The hotel wishes to save the world's natural resources(资源). Every day, tons of detergent(洗涤剂) and millions of tons of water are used to wash towels(毛巾) which have been used only once.
Here's how you can help:
A towel on the rack(架子)means: "I'll use it again."
A towel on the floor means: "Please change."
3
Your bedclothes are changed every day.
If you'd like to help save the world's resources, just leave this card in the morning. Your bed will be made up as usual but the sheets will not be changed. In this way, we can both help protect our environment.
