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湿空气在某干燥器中与一湿物料接触，当干燥处于等速干燥阶段时，下列有关说法不正确的是（）
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K2Cr2O7法测定铁含量时应加（）
(A)Many of us don’t pay much attention to the importance of eye care.It is said that if you take care of your body,then you can surely be healthy.That is why our eyes should be given a lot of care.Natural eye care should be put in a number one place.There are several causes leading to poor eyesight like not enough food,genes and aging.Televisions,computers and reading are also the causes of having poor eyesight.If you happen to work in front of the computer,it is best to take a break every once in a while.Something dirty can cause redness and they will make you feel uncomfortable.It is bad for your eyes,too.If this happens,the best way is to clean your eyes by using cold water.You must also try your best to protect your eyes from harmful things.For example,sunglasses are not just for fashion but they can also serve as a great way to protect your eyesight from UV rays.Eating healthy foods will do good to your eyesight.Remember that vitamins A,C and E are good for eyes.Try to eat food groups that have these vitamins.And you should do eye exercises because exercise protects your eyesight,too.If a person exercises regularly and eats the right kind of food,his eyes will stay in good condition for a long time.All above are natural ways of eye care that help us keep healthy eyes.Being happy all the time can be helpful to a person’s eyesight,too.In a word,eye care is very important,no matter how old a person is. All the following causes can lead to bad eyesight EXCEPT（）.
某企业采用表结法计算利润，下列账户中，2014年11月末不可能有余额的账户是（）
甲企业上月已预付乙企业购货款20 000元，本月从乙企业购货28 000元，余款暂欠，则甲企业应（）
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