求翻译：This specification must be checked by the contractor. Should the instructions prove inadequate or incorrect,the contractor shall inform the customer in writing. This also applies to any contradictions between the specification and content of standards, rules and regulations, where such contradictions affect the contractor’s work. If the contractor intends to carry out any work on the components other than that required in this specification, he must obtain prior written approval from the customer.是什么意思？

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