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[音频]

A. Because it is their custom.
Because they can walk faster.
C. Because it is the easiest way to carry water.
D. Because they are too old to use their hands.

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[音频]

A. Because they walk a lot and push a heavy can.
Because they carry heavy water on their heads.
C. Because it's difficult to walk on the bumpy road.
D. Because it's difficult to pump water into a plastic can.

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属于水硬性胶凝材料是（）。

A. 各种水泥
B. 石膏
C. 沥青
D. 水玻璃

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硅酸盐水泥的组成材料包括（）

A. 熟料
B. 石灰
C. 石膏
D. 混合材料（或不掺）

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硅酸盐水泥熟料主要有哪些矿物组成（）

A. 硅酸三钙
B. 硅酸二钙
C. 铝酸三钙
D. 铁铝酸四钙

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[音频]

A. Because it is their custom. Because they can walk faster. C. Because it is the easiest way to carry water. D. Because they are too old to use their hands.

[音频]

属于水硬性胶凝材料是（）。

硅酸盐水泥的组成材料包括（）

硅酸盐水泥熟料主要有哪些矿物组成（）

A. Because it is their custom.
Because they can walk faster.
C. Because it is the easiest way to carry water.
D. Because they are too old to use their hands.