2017届高考英语语法词汇综合练系列（第01期）：01（江苏卷适用）（原卷版）_高考复习指南

　　Pros

　　●Arch bridges are strong thanks to their curved designs, which

　　the load force being pushed straight downwards.

　　●The designs also contribute to the equal

　　of the bending force, and thus the bridges are more

　　to the force.

　　●Diverse materials used to build arch bridges are

　　●The application of these materials enables the bridges to undertake heavy pressure, thus making them

　　The use of the keystone and abutments make the bridges stronger and more durable.

　　Cons

　　The span length of an arch bridge is limited and how much weight it can bear

　　on its size and building materials.

　　Arch bridges require maintaining

　　due to the impact of wind forced on them.

　　The construction of an arch bridge is the

　　of more time and labor.

　　Arch bridges can only be located where the foundations on both sides are solid and stable.

　　conclusion When people decide to build an arch bridge, they must consider the aforementioned pros and cons.

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