Medium
The gold numbers of protective colloids $A, B, C$,and $D$ are $0.04, 0.004, 10$,and $40$ respectively. The order of their protective power is:
- A$A > B > C > D$
- B$B > A > C > D$
- C$D > C > A > B$
- D$D > C > B > A$
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