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【单选题】
遗传因素在发病中起重要作用的精神障碍是()。
A.
神经症
B.
学校恐怖症
C.
心因性精神障碍
D.
精神分裂症
E.
血管性痴呆
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【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】为了( ),在贮存和使用易燃液体的区域必须要有良好的通风。
A.
防止易燃气体积聚而发生爆炸和火灾
B.
冷却易燃液体
C.
保持易燃液体的质量
【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。
A.
)
B.
防止易燃气体积聚而发生爆炸和火灾
C.
冷却易燃液体
D.
保持易燃液体的质量
E.
令使用者身心舒畅
【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
【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}
A.
1
B.
2
C.
3
D.
4
【单选题】40g吐温80(HLB为15)与60g司盘(HLB为4.3)混合后HLB为( )
A.
12.6
B.
4.3
C.
6.5
D.
8.6
【单选题】crankshaft
A.
制动
B.
C.
曲轴
D.
废气
【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。()
A.
正确
B.
错误
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