A、正确
B、错误
答案:A
A、正确
B、错误
答案:A
A. 1.5 v
B. 1.6 v
C. 1.7 V
D. 1.9 V
解析:题目解析 题目要求判断充足电的蓄电池单格电压应不小于多少且在5秒内保持稳定。选项中,只有C. 1.7 V满足这个条件,因为1.7 V是一个相对较高的电压值,而其他选项1.5 V、1.6 V、1.9 V都小于1.7 V,不符合题目要求。
A. 质量轻;承载能力强
B. 传动平稳;强度高
C. 传动平稳;承载能力强
D. 质量轻;强度高
解析:题目解析 题目要求选择齿轮传动的两个基本要求,正确的选项应当包括传动平稳和承载能力强。传动平稳是因为在实际应用中,齿轮传动需要保证运动平稳,减少振动和冲击;承载能力强是因为齿轮传动需要能够承受一定的载荷和力,确保系统正常运行。因此,答案选择为 C. 传动平稳;承载能力强。
A. 正确
B. 错误
A. 正确
B. 错误
A. 1 s
B. 5 s
C. 15 s
D. 8 s
解析:BF0013 由于起动机的起动电流很大,故每次起动时间不能超过( )。 选项 C. 15 s 答案: C 解析:起动机的起动电流很大,因此每次起动时间不能太长,以避免过大的电流对电路和设备造成损坏。15秒的时间已经是一个相对较长的时间,超过这个时间可能会对起动机和电路产生过大的负担。
解析:解析:评分标准:答对①~⑤各占20%。
A. 正确
B. 错误
解析:这道题是关于BB011直动溢流阀的特点的判断题。答案是A,也就是说这个说法是正确的。
BB011直动溢流阀的特点是结构简单,灵敏度高,但压力受溢流流量的影响较大。这是因为直动溢流阀是一种通过调节阀芯的位置来控制流体流量的阀门,结构相对简单,所以灵敏度较高。但是,由于溢流阀的工作原理是通过溢流来控制压力,所以压力受溢流流量的影响较大。
举个生动的例子来帮助理解,可以想象一下水龙头的开关。当你轻轻转动水龙头的开关,水流就会随之而变化,这就是类似于直动溢流阀的工作原理。但是,当水流量变大时,水压也会相应地增加,这就是压力受溢流流量影响的情况。
A. 正确
B. 错误
解析:解析:正确:对受力较大部位的裂纹,可用电弧冷焊进行修理或换用新件。
A. 煤气机
B. 蒸汽机
C. 电动机
D. 汽轮机
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.
A. 正确
B. 错误
解析:解析:正确:柴油机大多数采用以压力循环润滑为主、飞溅油雾润滑为辅的综合润滑方式。