Difficult
The gold numbers of protective colloids $A, B, C,$ and $D$ are $0.50, 0.01, 0.10,$ and $0.005$ respectively. The correct order of their protective power is:
- A$D < A < C < B$
- B$C < B < D < A$
- C$A < C < B < D$
- D$B < D < A < C$
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