The cheek length of a block in inches should be about（）.<br>A:three times the circumference of a manila line<br>B:five times the diameter of a manila line<br>C:twice the diameter of its sheaves for manila line<br>D:twenty times the diameter of a manila line

The cheek length of a block in inches should be about（）.
A:three times the circumference of a manila line
B:five times the diameter of a manila line
C:twice the diameter of its sheaves for manila line
D:twenty times the diameter of a manila line

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