One of the main differences between the various types of screw pumps is in the （）.<br>A:stuffing box diameter<br>B:direction of rotation of the screws<br>C:pitch of the screws<br>D:type of driving gears

One of the main differences between the various types of screw pumps is in the （）.
A:stuffing box diameter
B:direction of rotation of the screws
C:pitch of the screws
D:type of driving gears

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