在酸性介质中,用KMnO4溶液滴定草酸盐,滴定应()。 A.像酸碱滴定那样快速进行

题型:单项选择题 A1/A2型题

问题:

在酸性介质中,用KMnO4溶液滴定草酸盐,滴定应()。

A.像酸碱滴定那样快速进行

B.在开始时缓慢进行,以后逐渐加快

C.始终缓慢地进行

D.开始时快,然后缓慢

E.不需要特别注意滴定速度

考点:理化检验技术(主管技师)理化检验(主管技师)基础知识综合练习理化检验(主管技师)基础知识综合练习题库
题型:单项选择题 A1/A2型题

下列哪项不是三叉神经的分支()。

A.眼支(第Ⅰ支)

B.上颌支(第Ⅱ支)

C.下颌支(第Ⅲ支)

D.颧支

E.下牙槽神经

题型:单项选择题 A1/A2型题

A little boy went to a farmer who had some puppies (小狗)to sell and said, “I want to buy one of your puppies.” Then reaching deep into his pocket, he pulled out a handful of change and held it up to the farmer. “I’ve got thirty-nine cents. Is that enough to take a look.”

“Sure,” said the farmer. Then he called his dog, “Here, Dolly!”

Out from the doghouse and down the ramp(斜坡) ran Dolly followed by four little balls of fur. The little boy pressed his face against the chain link fence. His eyes danced with delight.

As the dogs made their way to the fence, the little boy noticed something else moving inside the doghouse. Slowly, another little ball appeared. This one was much smaller than the others. Down the ramp it slid(滑行). Then in a somewhat awkward manner the little pup began hobbling(蹒跚) toward the others, doing its best to catch up…

“I want that one,” the little boy said, pointing to the slow dog.

The farmer knelt down at the boy’s side and said, “Son, you don’t want that puppy. He will never be able to run and play with you like these other dogs will.”

With that the little boy stepped back from the fence, reached down, and began rolling up one leg of trousers. There was a steel brace(支架) running down both sides of his leg. It was joined to a specially made shoe. Looking back up at the farmer, he said, “You see, sir, I don’t run very well myself, and he will need someone who understands.”

The world is full of people who need someone who understands.

小题1: It can be inferred that “Dolly” in the passage was _______.

A.a mother dog

B.the little boy’s name

C.the farmer’s son

D.one of the puppies小题2:How many puppies did the farmer have in all?

A.3

B.4

C.5

D.6小题3:The little boy decided to buy the smallest puppy because _______.

A.he was disabled and decided to be a vet (兽医) to cure it

B.he knew the smallest puppy needed understanding and care most

C.he liked puppies that were unable to run fast

D.he didn’t have enough money to buy a different one

题型:单项选择题 A1/A2型题

嘌呤和嘧啶环中均含有(),因此对()有较强吸收。

题型:单项选择题 A1/A2型题

某企业工程项目管理数据库的部分关系模式如下图所示,其中带实下划线的表示主键,虚下划线的表示外键

其中供应关系是(5)的联系。若一个工程项目可以有多个员工参加,每个员工可以参加多个项目,则项目和员工之间是(6)联系。对项目和员工关系进行设计时,(7)设计成一个独立的关系模式。

(7)处应填()。

A.多对多的联系在向关系模型转换时必须

B.多对多的联系在向关系模型转换时无须

C.只需要将一端的码并入多端,所以无须

D.不仅需要将一端的码并入多端,而且必须

题型:单项选择题 A1/A2型题

酸浴贮罐、水槽上盖作业要铺设跳板,戴好()。

A、眼镜

B、行灯

C、安全带

D、手电

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