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问题 问答题 简答题

离心泵运转中的换油步骤？

答案

参考答案：

①旋转轴承箱加油孔丝堵，打开加油孔。

②加注新油。

③旋转轴承箱放油孔丝堵，排放旧油。

④直至旧油放净，拧紧放油孔丝堵。

⑤当加注新油油位至油标尺1/2—2/3，停止加油。

⑥拧紧加油孔丝堵。

⑦清理泵体及基础油污。

不定项选择题

在盐酸中不可能大量存在的离子是：[ ]

A、H-

B、Br-

C、HCO3-

D、Ag+

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单项选择题

What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.

A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus; the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fit the (11) . It’s like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply aren’t any early childhood memories to (13) . According to Dr. Simms, children need to learn to use someone else’s spoken description of their personal (14) in order to turn their own short-term, quickly forgotten (15) of them into long-term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) --Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Oceanz Park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.

Notes: childhood amnesia 儿童失忆症。

（6）（）

A.declines

B.assesses

C.estimates

D.maintains
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