【单选题】In a four-stroke/cycle diesel engine, the camshaft rotates at _____.
A.
twice the crankshaft speed
B.
half the crankshaft speed
C.
the same speed as that of the crankshaft
D.
a speed independent of that of the crankshaft
【单选题】在贮存和使用易燃液体的区域必须要有良好的通风条件, 其主要目的是为了。
【单选题】The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at .
A.
one half crankshaft speed in a two-stroke cycle diesel engine
B.
crankshaft speed in a two-stroke cycle diesel engine
C.
two times crankshaft speed in a two-stroke cycle diesel engine
D.
one-fourth times crankshaft speed in a four-stroke cycle diesel engine
【单选题】在下列各式中正确的个数是( ) 11∈{0,1,2};2{1}∈{0,1,2};3{0,1,2}⊆{0,1,2};4{0,1,2}={2,0,1}
【单选题】40g吐温80(HLB为15)与60g司盘(HLB为4.3)混合后HLB为( )
【单选题】The crankshaft deflection is at first to be _____ before and after repair.
【判断题】( 判断题 ): 机床中 Z 轴方向是于机床主轴平行的方向,正方向为刀具远离工件的方向
【判断题】机床中Z轴方向是于机床主轴平行的方向,正方向为刀具远离工件的方向。()