一些新的木板路可能是由混凝土或合成所制。

Some of the new boardwalks may be concrete or synthetic.

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此单元组包括投掷并完成混凝土制品，操作机器挤压，制模，按压和烘烤粘土制品，操作机器构型和切割并完成石材产品的工人。

This unit group includes workers who cast and finish concrete products, operate machines to extrude, mould, press and bake clay products, and operate machines to form, cut and finish stone products.

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适用于水化温度低的普通建筑施工和制混凝土砖。

Used in ordinary construction works and in making block concrete for which a low hydration temperature is desired.

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