The constraint conditions can be used to identify the availability of the strength criterion and they are helpful to measure the basic strength parameters.
该限制条件既可验证强度准则的可用性又有助于实验确定基本强度参数。
This expression must identify a single element or attribute whose content or value is used for the constraint.
该表达式必须标识其内容或值用于约束的单个元素或特性。
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