问题
填空题
万向节的作用：使交叉两轴在一定的角度范围内平稳，可靠地传递（）。
答案
参考答案：扭矩
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万向节的作用：使交叉两轴在一定的角度范围内平稳，可靠地传递（）。
参考答案：扭矩
| 完形填空。 | |||
| We always want what we cannot have. When we're young, we want to stay out late, have romantic relationships,and be __1__.However,when we're __2__,we want to go back to being young and we __3__ the days when we didn't have to worry about complex love affairs,__4__ pressure,and money problems.Young people believe adulthood __5__ freedom from parents and schoolwork.When they get older,they feel that __6__ is freedom from work pressure and family responsibilities.To __7__ this feeling, people say,"The grass is always __8__ on the other side." As __9__,we like to be adults, but as young adults, we __10__ to be young again. We think about staying out late,__11__ our own money to spend.Suddenly,they see that love can result in __12__ heart s；staying out late makes it hard to get ready for __13__ the next morning.They find out that adult life is not as __14__ as they thought it would be and suddenly,__15__ becomes very scary. Life is __16__.It gives us time to __17__ but also requires us to work.The time will come when we must grow up and we will always look back wishing we __18__ being young a bit longer.That time will not come back.It is normal to want what we cannot have but the _19_ is that to be happy is to appreciate what we have.That is the first step to growing up.__20__ life becomes more complex we will not regret the time we wasted wishing we were adults. | |||
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可与食盐制取浓HCl、浓HCl可与KMnO4制取C
l2，选用
下图所示装置（含有所盛放的试剂）设计实验。
HCl，Cl2的化学反应方程式：
_________________________________。