在手足口病患病儿的护理中，专家指出注意口腔皮肤清洁，每天用生_爱下问搜题

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问题问答题

在手足口病患病儿的护理中，专家指出注意口腔皮肤清洁，每天用生理盐水清洁口腔．生理盐水是指浓度为______的NaCl溶液．要配置1000克这样的溶液需要NaCl______克，水______毫升．

答案

生理盐水的浓度为0.9%的氯化钠溶液；溶质质量分数=

溶质质量

溶液质量

×100%可知溶质质量=溶液质量×溶质质量分数

=100g×0.9%=9g，所需水的质量为100g-9g=991g，所以需水的体积为

991g

1g/ml

=991ml

故答案为：

0.9%，9，991

完形填空

Have you heard of the term “etiquette” And do you know that etiquette is not only a useful word 1 very useful to understand?
Etiquette is not the same in every culture 2 in every situation. For example, standing very close to the person you are talking with is quite common in some Asian countries. However; if you do this in Europe, some 3 people might feel 4.Even in China, we all know that etiquette is not the same in all situations. Perhaps we think that talking loudly in our own homes is fine, but there are other places where talking loudly is 5 .For example ,most people would agree that talking loudly in a library, a museum, or a movie theater is 6 .Even if you are with your friends, it is better to keep your voice 7 in public places. In fact, we should also 8 not to cough or sneeze loudly in public.
If we see someone 9 the rules of etiquette, we may politely give them some suggestions. Perhaps one of the most polite ways 10 ask someone, Would you mind doing this or Would you mind not doing that. For example, if someone cuts 11 you in a line, you could ask them, Sorry, would you mind 12 the line? If someone is smoking on the bus you could ask, Excuse me, could you please 13 that cigarette? People don’t usually like 14 , so we have to be careful how we do this.
Although rules of etiquette can often be different, some rules are the same almost everywhere in the world! For example, 15 is almost never allowed. If you see someone you know doing this, you can ask them, Would you mind picking it up?

A．comfortable

B．uncomfortable

C．not allowed

C．take care of

B．in front of

C．in the front

D．in the front of

A．be criticized

B．to criticize

C．to be criticized

A．dropping litter	B．chopping trees
C．smoking	D．picking litter up

选择题

有一摆长为L的单摆，悬点正下方某处有一小钉，当摆球经过平衡位置向左摆动时，摆线的上部将被小钉挡住，使摆长发生变化．现使摆球做微小幅度摆动，摆球从右边最高点M至左边最高点N运动过程的闪光照片如图所示（悬点和小钉末被摄入），P为摆动中的最低点，已知每相邻两次闪光的时间间隔相等．由此可知，小钉与悬点的距离为（　　）

A．

B．

C．

D．无法确定