①侵权要赔偿  ②有权必有责  ③权责要对等  ④失责要追究  ⑤用权受监督

House Rules
1. Please clean up before leaving.
2. Showers to be taken before 11 p. m.
3. No staying out ’after 10p. m. unless allowed by me.
4. You may have incoming calls on my mobile phone but no out going calls.
5. Bed time is 11 p. m.
6. Dinner is at 7p. m. unless noticed. (通知). (If you don’t have dinner, you must let us know before 6 p. m. )
7. Keep noise to the least.
8. No smoking in the bedroom.
CB4 1LT
The address you are staying at is:
112 Kendal Way 
Chesterton
Cambridge
 Contact  numbers:
My mobile number  is
07870  347980

连词成句。

A、B两种固体物质的溶解度曲线如图所示，据图回答下列问题：

（1）分别将相同质量的A、B饱和溶液，从30℃降到20℃，析出晶体较多的是　____ 　（填“A”或“B”）．

（2）30℃时，将20g物质A溶于50g水中，所得溶液中溶质的质量分数为____ ．