Which cargo tank type carries substances like calcium carbide and cement?

The correct choice is the dry-bulk cargo trailer. This type of trailer is specifically designed to transport dry bulk materials, which include substances such as calcium carbide and cement. These materials are typically powdered or granular solids that need a specialized form of transport to prevent spillage and contamination. Dry-bulk cargo trailers features reinforced containers that allow for the movement of these materials in a safe and efficient manner.

In contrast, the other options do not suit the requirements of transporting solid materials like calcium carbide and cement. For instance, a compressed gas tube trailer is designed to transport gases under pressure, which does not apply to dry substances. A high-pressure cargo tank is used for transporting liquids under high pressure, such as gases or pressurized liquids, which also does not align with the need to carry bulk solids. Similarly, a non-pressure liquid cargo tank is suited for transporting liquids that do not require pressurization and is not ideal for dry materials. Thus, the dry-bulk cargo trailer is the most appropriate choice for substances like calcium carbide and cement.