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【多选题】
设有广义表 D =(a,b, D ), 其长度为( ),深度为( )。A.
∞
B.
3
C.
2
D.
5
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举一反三
【单选题】One method of determining crankshaft misalignment is by（）
A.
laying a straight edge across the crank webs at the crankpin and measuring the distance to the crankpin in two places
B.
measuring the crank drop on either side of each crank throw while the crankshaft is slowly rotated through one revolution
C.
rotating the crankshaft through one revolution, pausing each 90oof rotation to measure bearing clearances, top and bottom
D.
taking micrometer reading between the crank cheeks opposite the crankpin every 90°of crank angle rotation
【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】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
【简答题】crankshaft
【简答题】为了（ ），在贮存和使用易燃液体的区域必须要有良好的通风。
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