问题
单项选择题
原子吸收分光光度法测定铁、锰等离子时，通常加入另一种金属离子与干扰物如磷酸盐、硅酸盐、铝酸盐等含氧阴离子形成难解离的稳定化合物而释放出待测元素，请指出通常加入下列离子中的哪一种？（）。
A.Na离子
B.K离子
C.Ni离子
D.Ba离子
E.以上都不是
答案
参考答案：E
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原子吸收分光光度法测定铁、锰等离子时，通常加入另一种金属离子与干扰物如磷酸盐、硅酸盐、铝酸盐等含氧阴离子形成难解离的稳定化合物而释放出待测元素，请指出通常加入下列离子中的哪一种？（）。
A.Na离子
B.K离子
C.Ni离子
D.Ba离子
E.以上都不是
参考答案：E
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| Health is important to everyone. You should take care of your health. Many people 1 they don't need to take care of their health when they are young. Do they only need to take care of 2 health when they are old? The answer is "No". Many young people die 3 they have health problems. Then, what should you do to keep healthy? First, you must try to drink a lot of 4 every day. Doctors say that people should drink more than eight cups of water a day. It can 5 you away from illness. Remember to do 6 every day. Doing exercise can keep you healthy. It can make you 7 . It is also a good way to help you 8 Eat healthy food. This is one of the best 9 for you to keep healthy. You should try to eat a balanced diet (平衡饮食) every day. Sleeping is also very 10 . When you sleep, you can have a good rest. Getting a good sleep every night can reduce (减少) the chance you fall ill. | |||
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