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单项选择题

下列不属于油液分析技术手段的是（ ）

A、光谱分析
B、铁谱分析
C、理化性能检测
D、超声波检测
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半拖鞋式活塞和拖鞋式活塞的优点是（）
A.质量轻
B．适合安装在高速发动机
C．可以减小与气缸的配合间隙
D．能避免与曲轴发生运动干涉
E．可以增加活塞的行程
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【填空题】Fill in each blank with one of the two words from each pair in their appropriate forms and note the difference of meaning between them. restraint constraint 1、Options are offered subject to staff availability and timetable . 2、Reminding all concerned that violence breeds violence, they repeat their appeal for calm and . 3、The appalled chief warned his violent officers to show . 4、We have just been looking at the number of coal mine accidents, and they can certainly be a big on what China is striving for.
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