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已知某酸碱滴定的突跃范围是4.1~9.6，则不能选用下列那种指示剂？( )
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甲基红指示剂变色范围为4.8~6.0，故在pH=5.2的溶液中应呈现红与黄的混合色。
在滴定分析中，计量点与滴定终点必须完全一致。（ ）
选择恰当的词汇填空Academic pressure doesn't necessarily wait until college to become a problem. Over-achieving students who are much younger face burnout（筋疲力尽）, depression and even nervous breakdowns because of the 1) ______ that their parents, schools or they, themselves, place on them to succeed. Here are a few things to do that will help you cope with it.1. Set your 2) _____ and follow them. As the saying goes, “If your destination is unclear, you'll never know if you've arrived.” Make a list of what you need to accomplish and create a 3)________ for their completion. From time to time, check on your progress. You'll find two things have happened. First, by being 4) ________ , you will most likely be able to accomplish more in less time. Second, you will have a feeling of accomplishment for having done what you have set out to do. Both results will reduce the 5)______ pressure you may be feeling.2. Start keeping a diary in which you elaborate on（详细描述）the pressures you face. There is nothing so damaging as allowing the pressure to build up within you, because it will inhibit （禁止）your ability to produce. Also, simply putting your feelings on paper tends to reduce the pressure more 6) _______ .3. Make as many friends as you can, and spend time with people you love and who love you. 7)________ to spend time with them at least once or twice each week. Diversions（转移，分散） such as this tend to keep your mind off of the stress, besides being enjoyable.4. If you still find the academic pressure unbearable, consider professional help. A professional, now is a recognized way to solve this type of problem. Probably you will find such help 8)________ at your school. If not, seek help 9)________..5. Exercise daily. Taking a few minutes to briskly walk around the block can make you more relaxed. If you have more time, 10)_______ at a gym or run a mile. There is nothing that can reduce the feeling of stress more than exercise.
算术平均数与中位数相比,其优点是
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