To safeguard the operator and other personnel working on or near a hoisting operation which of the following precautions should be observed?（）

A、Keep a load on the hoist until all personnel are finished working

B、Set the load on a movable dolly when transportation may be needed

C、Have one man keep a hand on the load to steady it

D、Insure that the lifting gear capacity is not exceeded

Basically the bedplate consists of two （）, which run the length of the engine.

A、longitudinal girders

B、transverse girders

C、fore girders

D、aft girders

Low compression pressure in a diesel engine can be caused by（）

A、improperly seating intake valves

B、leaking cylinder liner seal rings

C、late fuel injection timing

D、carbon deposits on the piston

Most anchor handling equipment incorporates （） for mooring purposes.

A、cable lifters

B、spur wheels

C、bollard

D、warpends

The load between two steam-driven alternators operating in parallel may be adjusted by varying （）

A、the speed of the alternators

B、the field strength of the machines

C、the power factor of the alternators

D、steam supply to the prime movers

Which of the following problems will occur if the internal drain at either end of a hydraulic, two-way, spool-type directional control valve cylinder were to become plugged?（）

A、The reservoir would become vapor bound

B、The valve would be placed in hydraulic lock

C、The spring loaded relief ports would open

D、The buffering chambers would be unable to function