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单选题
Coils and probes are not always interchangeable between various types of instruments and, for best results, should be matched to a specific instrument and frequency range.
A
Coils are not always interchangeable with probes between different types of instruments. They should suit to a particular instrument and frequency range for best effects.
B
Various types of instruments are not always capable to alternate coils and probes and it＇s best to be compared with the similar instrument and frequency scope.
C
Coils and probes of various types of instruments can not be interchanged, and they should be suited to a specific instrument and frequency range in order to obtain the best results.
答案解析
正确答案：A
