如果它们有uri，那么它们必须表示为您在清单1中看到的形式：用尖括号将绝对URI引用括起来。
If they have a URI, they must be presented in the form you see in Listing 1: the absolute URI reference enclosed in Angle brackets.
不是括号，是钢筋的形式示意图，下面的数字表示钢筋弯折部分的长度。
But it should be noted that steel plate sheer is strong, and the rebar structure is complex, meaning that the construction is difficult.
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