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单选题
566 Individual electrical symbols are provided in this specification as a suggestion for those who do not have an established code.
A
In this specification, for those who do not have an established code,individual electrical symbols are given as a suggestion.
B
As a suggestion for those who do not have an established code,individual electrical symbols are gained in this specification.
C
As a suggestion for those who do not have an established code,individual electrical symbols are required in this specification.
答案解析
正确答案：A
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