If clearance between a piston and the cylinder wall is excessive, piston slap will occur.
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
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International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in
A. SOLAS
B. MARPOL
C. STCW
D. Ballast Water convention
Gear pumps are widely used to transfer any one of the following but .
A. fuel oil
B. lube oil
C. hydraulic oil
D. fresh water
经济处于充分就业，如果总需求增加________。
A. 会产生通货膨胀缺口，同时随着货币工资率上升，AS曲线向左移动
B. 会产生通货膨胀缺口，AD曲线向左移动
C. 会产生通货膨胀缺口，潜在GDP增加，缺口减小
D. 会产生衰退缺口，同时随着货币工资率下降，AS曲线向左移动
E. 会产生衰退缺口，同时随着货币工资率上升，AS曲线向左移动
Which statement is NOT true？
A. While displacement pump works, volume of the working chamber will increase and decrease alternately
B. A gear pump always has two gears
C. Any vane pump will have a rotor within a ring
D. A balanced vane pump has two outlet ports and they are positioned symmetrically
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