问题
选择题
下列实验操作正确的是
答案
答案：D
A、点燃酒精灯要用火柴，不可用酒精灯去引燃，否则会引起火灾，故A错误；
B、量筒量液时要注意量程的选择，应选择略大于量取液体体积的量程．应选10毫升的，故B错误；
C、氢氧化钠是易潮解的物品，应放在玻璃器皿中称量，不应放在纸片上，故C错误；
D、图示的浓硫酸稀释的操作，严格按照实验室的规定进行操作，故D正确．
搜题请搜索小程序“爱下问搜题”
下列实验操作正确的是
答案：D
A、点燃酒精灯要用火柴，不可用酒精灯去引燃，否则会引起火灾，故A错误；
B、量筒量液时要注意量程的选择，应选择略大于量取液体体积的量程．应选10毫升的，故B错误；
C、氢氧化钠是易潮解的物品，应放在玻璃器皿中称量，不应放在纸片上，故C错误；
D、图示的浓硫酸稀释的操作，严格按照实验室的规定进行操作，故D正确．
阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。 注意：每个空格只填一个单词。 For years, researchers have looked into a possible relationship between heat and violence. There are conflicting results over whether there is an actual connection between rising anger and rising temperature, but the murder rate constantly increases during the months of July and August, according to the FBI’s annual crime report. Many police chiefs say they put more policemen on the streets when the heat rises. “Calls for service always increase from May, June, July and August,” said New Bedford’s Captain Richard Spiriet. “The longer period of time you have the heat, the worse it is. It’s just the opposite in the winter time.” Craig Anderson, a professor and specialist in social psychology at Lowa State University, argues the evidence is clear. “As the temperature goes up, people become more uncomfortable. They become easier to get angry,” he said. “That increases the possibility that a small conflict will be interpreted as more major.” Anderson conducted a couple of studies looking at crime rates over the course of several years within the same area to see when most violent crimes occurred. He found that violent crimes were more likely to occur on hot days and hot months － even hot years had higher violent rates than cold years, according to his research. Other research shows it is not so much the physical climate, but rather the social climate, that causes increased violence. “During the summer months, people stay up later. They talk with their neighbors. They party with their friends,” said Jack Levin, director of the Brudnick Centre on Violence at Northeastern University. “There are more likely to be large numbers of people interacting, and they are more likely to argue.” Perhaps the realization that there is a link will help people in an argument step back and say, “Let’s cool off” － both literally (字面上地) and figuratively (比喻地).
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