Chuyển sơ đồ chữ thành câu hoàn chỉnh (sử dụng bị động)
|1. cement, water, sand, gravel -> % prepare -> ...
To produce concrete, four different materials are prepared first, namely cement, water, sand and gravel with the percentages making up 15%, 10%, 25% and 50% respectively.
|2. ... -> concrete mixer -> concrete
Next, all four materials are blended together in a concrete mixer to create finished concrete and then it can be used for building purposes.