up and down；reciprocating
up and down；rotating
back and forth；reciprocating
back and forth；rotating
第1题：
If clearance between a piston and the cylinder wall is excessive, piston slap will occur. The slap itself is caused by_____.
A.alternation of side thrust
B.a breakdown of the lube oil film on the cylinder
C.worn piston boss piston pin bearings
D.fluctuating gas pressure in tile combustion space
第2题：
the piston rod
the tiller arm
the connecting rod
the rudder
第3题：
A、the other ones
B、other slippers
C、another pair
D、another slippers
第4题：
stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
accept most of the tensile loading that results from the firing forces developed during operation
mount the engine frame securely to the hull to prevent shaft coupling misalignment
connect the crosshead solidly to the piston rod
第5题：
Bypass the after-cooler to operate at speed
Run at reduced speed until the cooler can be repaired or renewed
Switch to diesel fuel and run at full speed
Nothing need to be done due to the low heating value of heavy fuel
第6题：
a variable displacement axial piston pump
a constant displacement axial piston pump
a reciprocating piston pump
a centrifugal pump
第7题：
The medium speed 4-stroke trunk piston engine
The low speed 2-stroke crosshead engine
The medium speed 2-stroke crosshead engine
The low speed 4-stroke trunk piston engine
第8题：
Piston cooling fins are located
A.atop the piston crown
B.beneath the piston crown
C.at the base of the piston skirt
D.inside the cylinder liner cooling water jacket
第9题：
cylinder liners and piston rings
main bearings
crankpin bearings
turboblower
第10题：
of crosshead type
of trunk piston type
of low speed type
all the above