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砼的标号越高，强度越大（）

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水泥的标号越高，其需水量越大（）

Piggyback is a system of unitized multimodal land transport by（）.

A. road and sea
B. road and rail
C. road and air
D. rail and road

渠道的设计流速应小于不冲流速（）

（）is a document granted by the customs authorities which allows a vessel tostart unloading goods.

A. Entry Inwards
B. Entry Outwards
C. Outward Export Permit
D. Inward Permit