A.flat surface
B.mirror finish
C.sloping surface
D.inclined surface
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A.upwards;top
B.upwards;bottom
C.downwards;top
D.downwards;bottom
A.accelerates;decelerates
B.accelerates;accelerates
C.decelerates;decelerates
D.decelerates;accelerates
A.up and down;reciprocating
B.up and down;rotating
C.back and forth;reciprocating
D.back and forth;rotating
A.rotary;reciprocating
B.up and down;fore and aft
C.fore and aft;up and down
D.up and down;rotary
A.advantages
B.disadvantages
C.power advantages
D.power disadvantages
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