问题
单项选择题
加入标准溶液后，滴定管尖嘴端留有气泡未排出，则测定结果（）。
A.偏低
B.偏高
C.无影响
D.精密度变好
答案
参考答案：B
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加入标准溶液后，滴定管尖嘴端留有气泡未排出，则测定结果（）。
A.偏低
B.偏高
C.无影响
D.精密度变好
参考答案：B
Li Ping's mother's birthday is coming soon, ____1____ he doesn't get a present for her. A watch can ___2_____ a good present, but it is too __3__ for Li Ping to buy because he doesn’t have enough money with him. ___4___ are not so expensive , but he doesn't think they are good enough for his mother __5___ they will die(死) soon. He does not know __6___of jackets or shoes his mother wears. Chocolates are too _7__ and his mother does not like them. Li Ping's sister, Li Lan, gives __8__ some advice(建议). She says, "Why don't you give your ___9____ a picture of yourself for her birthday? That shows your ___10__ for her" Li Ping thinks it is a good ____11____. No one is too poor to give love __12___ others, but ____13____ is the most expensive present in the __14__ and everyone is happy to __15__ it.
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