展成法磨削外球面可用（）砂轮。A.杯形 B.蝶形 C.平行 D.单边凹形

B

People use their mouths for many things. They eat, talk, shout and sing. They smile and they kiss. In the English language, there are many meanings using the word “mouth”. But some of them are not so nice.

For example, if you say bad things about a person, the person might protest (抗议) and say “Do not bad mouth me.”

Sometimes, people say something to a friend or family member that they later regret(后悔) because it hurts that person’s feelings. Or they tell the person something they were not supposed to tell. The speaker might say, “I really put my foot in my mouth this time.” In other words, he might feel sad for saying the wrong thing.

Sometimes when one person is speaking, he says the same thing that his friend is going to say. When this happens, the friend might say, “You took the words right out of my mouth!”

Some people have lots of money because they were born into a very rich family. There is an expression for this, too. You might say such a person “was born with a silver spoon in his mouth”.

This rich person is the opposite of a person who lives “from hand to mouth”. This person is very poor and only has enough money for the most important things in life, like food.

小题1:“I really put my foot in my mouth this time” means _________.

A．I regretted I had done the thing

B．I really did this

C．I have never done this thing

D．I want to do this thing小题2:When your friend took the words right out of your mouth, you can say “_________”.

A．You are clever

B．I am very lucky

C．We have the same idea

D．I am very angry小题3:If a person lives from hand to mouth, he must be very _________.

A．rich

B．poor

C．happy

D．sad小题4:The passage mainly tells us _________.

A．everyone in England has the same mouth

B．people use their mouths to eat, talk, shout and sing

C．rich persons’ mouths are quite different with the poor persons’

D．the word “mouth” has many different meanings in the English language

为了预防碘缺乏病，国家规定每千克食盐中应含有40 mg~50 mg的碘酸钾。

为检验某种食盐是否为合格的加碘食盐，某同学取食盐样品428 g，加水溶解。将得到的溶液用足量的稀硫酸酸化并加入足量的碘化钾淀粉溶液，溶液呈蓝色。再将该溶液用0.03 mol·L^-1的硫代硫酸钠溶液滴定，当消耗18.00 mL硫代硫酸钠溶液时，溶液的蓝色刚好褪去，反应的离子方程式是。

（1）用淀粉碘化钾溶液和稀硫酸可定性检验出食盐中的 ，配平离子方程式。

______ +______I^-+______H⁺=______I₂+______H₂O

（2）若要检验食盐中是否含有K⁺，实验操作是__________________________。

（3）工业上用石墨和铁为电极电解KI溶液制取KIO₃。电解时，铁做______（填“阳极”或“阴极”），石墨电极上的电极反应式是_______________，电解过程中铁电极附近溶液的pH__________（填“变大”、“变小”或“不变”）。

（4）该食盐样品中KIO₃的含量是___________mg·kg^-1。

重复接地的作用是降低漏电设备外客对地电压，减轻（）断线时的危险。

A．零线

B．保护接地线

C．相线

D．相线和中线

治安联防队员张某在夜间巡逻，抓到可疑人李某，怀疑其为小偷，即把其叫进室内讯问。李某否认偷了东西，张某便把李某捆起来吊打，强迫其承认。结果造成李某轻伤。请问张某的行为构成何罪

A．非法拘禁罪

B．刑讯逼供罪

C．故意伤害罪

D．刑讯逼供罪和故意伤害罪

一个表中最多能定义255个字段。