雅思寫作話題及范文: The diagrams below show the stages and equipment use...

雅思寫作話題及范文: The diagrams below show the stages and equipment use...

范文

The diagrams show the processes and the equipments used to make cement, and how these are used to produce concrete for building purposes. The first step in the cement productions is to introduce limestone and clay. These materials pass through a crusher that produces a powder. Then this powder goes into a mixer. After this, the product passes to a rotating heater which works with heat. Afterwards, the mixture goes into a grinder where the cement comes out. At the end of the process, the cement is packed in bags.?? Referring to the concrete production, the process begins with a combination of 15% cement, 10% water, 25% sand and 50% gravel. These four elements are introduced into a concrete mixer.

As mentioned above, the concrete production takes fewer steps than the cement production, however, it is necessary to use more materials than the latter process in order to obtain the final product.

The last difference between both progresses is that the concrete mixer does not work with heat.

圖表顯示了用于制造水泥的工藝和設(shè)備，以及如何使用這些設(shè)備生產(chǎn)建筑用混凝土。水泥生產(chǎn)的第一步是引入石灰石和粘土。這些材料通過破碎機產(chǎn)生粉末。然后這些粉末進入混合器。之后，產(chǎn)品進入旋轉(zhuǎn)加熱器，該加熱器與熱量一起工作。然后，混合物進入粉碎機，在那里產(chǎn)出水泥。在工藝結(jié)束時，水泥用袋子包裝。關(guān)于混凝土生產(chǎn)，該過程從15%水泥、10%水、25%砂和50%礫石的組合開始。這四個元素被引入混凝土攪拌機中。

如上所述，混凝土生產(chǎn)的步驟比水泥生產(chǎn)的步驟少，但是，為了獲得最終產(chǎn)品，需要使用比水泥生產(chǎn)更多的材料。

兩種進度之間的最后一個區(qū)別是混凝土攪拌機不能在高溫下工作。

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