问题描述：
[单选]
（英英释义）Individual electrical symbols are do not have an established code．
A．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.
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下一篇：（英英释义）Individual electrical symbols are provided in this specification as a suggestion for those who do not have an established code．
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