Which of the following characteristics is true of screw pumps?
A. They can be used at low speeds.
B. They are inexpensive.
C. They have a low level of efficiency.
D. They have good suction characteristics.
A. Incorrect. Screw pumps can be used at high speeds.
B. Incorrect. Screw pumps are expensive.
C. Incorrect. Screw pumps have a high level of efficiency.
D. Correct. Screw pumps have good suction characteristics.
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