In many instances a void space will be created in the centre of the row，and a ______ should be placed so that it sits above the two innermost coils．A.locking coilB.sitting coilC.inner coilD.safe coil
In many instances a void space will be created in the centre of the row，and a ______ should be placed so that it sits above the two innermost coils．
A.locking coil
B.sitting coil
C.inner coil
D.safe coil
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