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【单选题】
患者，男，61岁，义齿1，上唇牵动时感觉疼痛，左侧咬食物时义齿不脱位，右侧咬食物时义齿脱落，有时将颊部软组织咬出血肿，检查见正中咬合接触良好，上唇系带处2mm大小的溃疡，左侧第二磨牙区的颊黏膜见4mm直径大小的血肿。引起左侧颊部咬出血肿的可能原因，下列哪项除外（）A.
颊部软组织内陷
B.
后牙覆盖较小
C.
后牙排列偏颊侧
D.
后牙覆盖较大
E.
咬合面有尖锐边缘
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【简答题】The function of power train (1) changing the speed, torque and direction by transmission. (2) transmitting power from the engine to the drive wheels. (3) cutting off the power by clutch. (4) th...
【单选题】The drive wheels of the vibratory roller are rubber-tyred and filled with water and calcium-( or magnesium) chloride to _______ the weight.
A.
decrease
B.
increase
C.
enlarge
D.
reduce
【简答题】请将这句话 The output shaft is a splined shaft that connects directly to the drive shaft through the differential to the drive wheels of the car.翻译成中文。
【简答题】如果缺少什么?地球上所有生物将会全部灭绝，人类也不例外?
【简答题】请翻译: The output shaft is a splined shaft that connects directly to the drive shaft through the differential to the drive wheels of the car.
【单选题】converts the reciprocating motion of the pistons into a rotary motion for the drive wheels.
A.
Crankshaft
B.
Camshaft
C.
Flywheel
D.
Timing belt
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