29. What kind of pumps is used for pumping viscous liquids? And the pump is self-priming and capable of producing a high vacuum. (A) Centrifugal pump (B) Screw pump (C) Volute pump (D) Diffuser pump

31. One kind of tools which are in common use for daily maintenance works on the ship delivers an impact momentum to an object. The tool comprises a handle and a head with most of the weight. The common uses of the tool are for driving nails, fitting parts, and breaking up objects. What tool is above description? (A) Drill (B) Screwdriver (C) Pliers (D) Hammer

29. What kind of pumps is used for pumping viscous liquids? And the pump is self-priming and capable of producing a high vacuum. (A) Centrifugal pump (B) Screw pump (C) Volute pump (D) Diffuser pump

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29. What kind of pumps is used for pumping viscous liquids? And the pump is self-priming and capable of producing a high vacuum.
(A) Centrifugal pump
(B) Screw pump
(C) Volute pump
(D) Diffuser pump