The gold numbers of protective colloids \( A, B, C \) and \( D \) are \( 0.04,0.004,10 \) and 40...

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The gold numbers of protective colloids \( A, B, C \) and \( D \) are \( 0.04,0.004,10 \) and 40 respectively. The protective powers of \( A, B, C \) and \( D \) are in the order:
(A) \( ABCD \)
(b) \( BACD \)
(C) \( DCAB \)
(d) \( DCBA \)
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