300. BE004 曲轴轴颈磨损后,可通过磨削修理。轴颈最大的缩小量不应超过( )。

解析：BG002 PT泵中的PTG调速器是( )调速器。 答案解析：PT泵中的PTG调速器是机械离心式两极调速器。PTG调速器用于控制PT泵的燃油供给量，以适应发动机负荷变化。机械离心式两极调速器通过离心力调整燃油供给，保持发动机的稳定运行。因此，正确答案为B，即机械离心式两极。

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解析： BJ007 在液压系统图中符号“ ”表示的是( )。 答案: A 解析: 给出的图形符号与固定节流器的特征相符。固定节流器用于限制流体通过，使流速降低，从而控制液压系统中的流量。其他选项的符号分别对应其他液压元件，不符合给定的图形。

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解析：解析:正确:以镍为主要添加合金元素的铜合金称为白铜。

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解析：题目要求找出关于膜片弹簧离合器说法错误的选项。正确答案为C. 膜片弹簧式离合器的压紧机构是支撑环。实际上，膜片弹簧离合器的压紧机构通常是由压盘和压紧盘组成，压盘上有膜片弹簧，通过压紧盘来实现压紧离合器，不涉及支撑环。因此选C。其他选项都是关于膜片弹簧离合器的正确描述。

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解析：解析:正确:风冷柴油机的燃烧噪声和机械噪声比水冷机高得多。

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解析： BF001 内燃机的分类按燃料不同可分为汽油机、柴<|endoftext|> There are several reasons why dogs may engage in excessive licking: Anxiety or stress: Licking can be a soothing behavior for dogs, similar to how humans may comfort themselves by biting their nails or twirling their hair. Dogs may lick excessively when they are feeling anxious, stressed, or nervous. Medical issues: Excessive licking can be a sign of underlying medical issues such as allergies, skin infections, or gastrointestinal problems. If your dog's licking is accompanied by other symptoms such as redness, swelling, hair loss, or a change in appetite, it's important to consult with a veterinarian. Boredom or lack of stimulation: Dogs that are bored or not getting enough mental and physical stimulation may resort to excessive licking as a way to pass the time. Attention-seeking behavior: Some dogs may lick excessively as a way to get attention from their owners. If your dog realizes that licking gets them attention or treats, they may continue to do so. Habit: Dogs are creatures of habit, and they may develop a licking habit if they find it comforting or rewarding in some way. It's important to observe your dog's behavior and consult with a veterinarian if you are concerned about their excessive licking. They can help determine the underlying cause and recommend appropriate treatment.

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解析：题目解析 题目要求在起重机吊重物之前进行试吊，试吊的高度为200mm左右，然后检查机身各部位是否有异常情况。试吊时间约为多少分钟。正确答案是D选项，即10分钟。 解析：进行试吊是为了检验起重机的工作状态和性能是否正常，以确保在正式吊运前没有问题。试吊高度较低，试吊时间较短，通常在10分钟左右，足以检查起重机的基本运行情况。

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解析：题目要求比较盲螺孔的钻孔深度与螺孔深度的差异。盲螺孔是指螺孔的底部并不贯穿整个工件，而是在一定深度后盲止的螺孔。一般来说，盲螺孔的钻孔深度大于螺孔深度，它们的差异约为螺孔直径（d）的0.5倍。因此，正确答案是选项 A. 0.5 d。

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解析：解析:评分标准:答对①②各占50%。

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