关于量块的使用方法,错误的是()。 A.在组合前先用苯洗净表面的防锈油,并用麂皮和软

题型:单项选择题

问题:

关于量块的使用方法,错误的是()。

A.在组合前先用苯洗净表面的防锈油,并用麂皮和软绸将其擦干

B.使用时不得用手接触测量面

C.使用后为了保护测量面不碰伤,应使量块结合在一起存放

D.要防止腐蚀气体侵蚀量块

考点:机械工程铸造工艺学铸造工艺学题库
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因式分解:(a+3)(a﹣7)+25=(    )

题型:单项选择题

阅读理解。

     The tea gardens in Sri Lanka are actually large estates (种植园). The best tea usually comes from plants

grown on high grounds, the cool hilltops with rows and rows of tea plants. The plants are about one metre

apart. The plant is often pruned so that it remains only 60 to 90 centimetres high. Pruning is important

because it encourages the growth of tender shoots, or young leaves. It is from these shoots that the best tea

is got.

     Practically all the tea pickers are women. The estates prefer to employ women pickers because they are

more careful. Their thin fingers can easily remove the twin leaves and new shoots from the plant, which are

the parts used for processing (加工) tea. The pickers carry large baskets into which they throw their pickings.

A skilled worker can harvest between 9 to 14 kilogrammes of tea leaves a day. Usually new shoots can be

picked from the plants about every ten or fifteen days.

      Processing tea shoots into the familiar dry tea leaves requires great care and skill. There are various

methods of processing depending on the type of tea required.For black tea,the young green leaves are first

spread out shelves to dry. This process removes much of its water and the leaves become soft. After this, the

leaves are passed through heavy rollers.This operation will press the leaves for juices which give the tea both

its colour and taste.Then the leaves are spread out on floors and left to ferment (发酵) under wet conditions.

Fermentation develops the rich taste of black tea.The fermented leaves are then dried with a hot-air blower

until they become rolled-up black leaves.The final step is to sort and grade them before the black tea is ready

for sale to countries all over the world.

1. In the first paragraph,the word "pruning" means _____.

A. regular cutting of the plants

B. frequent watering

C. regular use of chemicals

D. growing the plants high in the mountain

2. One of the reasons why women are employed to do the picking is that _____.

A. they work harder than men do in the picking

B. they can throw their pickings more easily into the baskets

C. their fingers fit them better for the job.

D. they can more easily find the twin leaves.

3. How many processing steps are mentioned in the last paragraph?

A. Three.

B. Four.

C. Five.

D. Six.

3. What is the writer's purpose in writing the passage?

A. To introduce various methods of tea processing.

B. To persuade readers to buy tea from Sri Lanka.

C. To tell a story that had happened in the tea gardens.

D. To inform readers of tea growing, picking and processing.

题型:单项选择题

不属于性能化防火设计规范特点的是()。

A.加速技术革新

B.提高设计的经济性

C.性能评判标准得到一致认可

D.加强设计人员的责任感

题型:单项选择题

公共事业管理中的激励的概念?

题型:单项选择题

进行公式排版时,()使用黑斜体。

A、变量

B、函数符号

C、矢量

D、张量

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