以下哪种溶液是重金属检查硫代乙酰胺法中用到的（） A.0.1mol/L_爱下问搜题

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问题单项选择题

以下哪种溶液是重金属检查硫代乙酰胺法中用到的（）

A.0.1mol/L盐酸

B.0.1mol/L高氯酸

C.醋酸缓冲溶液（pH3.5）

D.0.9%氯化钠

E.0.1mol/L氢氧化钠溶液

答案

参考答案：C

解析：本题考查重金属检查法中的硫代乙酰胺法。硫代乙酰胺法适用于溶于水，稀酸或乙醇的药物。检查原理为硫代乙酰胺在弱酸性（pH3.5醋酸盐缓冲溶液）条件下水解，产生硫化氢，与重金属离子生成黄色到棕黑色的硫化物均匀混悬液，与一定量标准铅溶液经同法处理后所呈颜色比较，判定供试品中重金属是否符合限量规定。

单项选择题 A1型题

调节可摘局部义齿固位力的措施如下，（）除外。

A.调整义齿就位道

B.调控基牙间的分散度

C.增减直接固位体的数目

D.需增加横向固位力者选用铸造卡环

E.调节卡环臂进入倒凹区的深度和坡度

完形填空

Monty Roberts owns a horse ranch（牧马场） in San Ysidro. He told us his story. As a senior, he was asked to write a 36 about what he wanted to be and do when he grew up.

That night he wrote a seven-page paper 37 his goal of someday owning a horse ranch. He wrote about his dream in great 38 and he even drew a diagram of a 200-acre ranch, showing the 39 of all the buildings.
He put his heart into the 40  and the next day he handed it in to his teacher. Two days later he received his paper back. On the front page was a large red F with a note that   41 , ‘See me after class.’
The boy with the dream went to see the teacher after class and asked, ‘Why did I 42 an F?’
The teacher said, ‘This is an 43 dream for a young boy like you. Owning a horse ranch requires a lot of money. There’s no 44 you could ever do it.’ Then the teacher added, ‘If you will 45 this paper with a more realistic goal, I will reconsider your grade.’”
The boy went home and 46 it. He asked his father what he should do. His father said, ‘Look, son, you have to 47 your own mind on this. However, I think it is a very 48 decision for you.’
Finally, after sitting with it for a week, the boy turned in the 49  paper, making no changes at all. He stated, ‘You can keep the F and I’ll keep my 50 .’
Monty now owned a 200-acre ranch. He had 51 his plan for a 4,000-square-foot house.
Two summers ago that same school teacher brought 30 kids to camp out on his ranch for a week. When leaving, he said 52 , ‘Look, Monty. When I was your teacher, I was something of a dream 53 . During those years I stole a lot of kids’ dreams. 54  , you had enough perseverance not to give up on yours.’”
Don’t let anyone steal your dreams. 55 your heart, no matter what.

B．composition

B．unbelievable

C．unrealistic

A．thought about

B．cared about

D．talked about

A．put forward

B．carried out

D．delightedly

D．Fortunately

D．Concentrate