单选题What happens to the efficiency of an anchor when it is moved from sand to mud?（）AThe efficiency increasesBThe efficiency decreasesCThe efficiency remains the sameDThe efficiency cannot be determined.
单选题
What happens to the efficiency of an anchor when it is moved from sand to mud?（）
A
The efficiency increases
B
The efficiency decreases
C
The efficiency remains the same
D
The efficiency cannot be determined.
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解析：
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