單項選擇題電磁波MWD儀器的兩根接收天線由電纜連接到SIR之前,要用大地電阻測量表Earth Resistance Meter測量兩根電纜之間的電阻,電阻應該在()范圍內(nèi)

A.10-60ohms
B.20-80ohms
C.40-100ohms
D.50-120ohms


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