问题 问答题 简答题

试述法兰与阀门大盖垫片更换有哪些要求?

答案

参考答案:

1.更换垫片前,应切断介质来源,放净管线或设备内压力,不准带压拆卸螺丝。

2.根据阀门,管线,设备口径,选用材料厚薄,尺寸合适的垫片,垫片内外边缘要整齐,圆滑,不许有缺沟,裂纹,损伤之处,装前两面涂黄油,以使接触面密封更好。

3.拆卸螺丝,要自上而下,撬开法兰时,人要站在侧面,防止介质喷出伤人。

4.法兰断开,取出损坏的垫片后,一定要把法兰的水线清理干净,不留残物

5.放入新垫片,一定要放正,螺丝对角上紧,整个圆周各点间隙大小一样,两法兰外沿要找平,不得错口。

单项选择题
单项选择题

(A)

Next time a customer comes to your office, offer him a cup of coffee. And when you’re doing your holiday shopping online, make sure you’re holding a large glass of iced tea. The physical sensation of warmth encourages emotional warmth, while a cold drink in hand prevents you from making unwise decisions-those are the practical lesson being drawn from recent research by psychologist John A. Bargh.

Psychologists have known that one person’ s perception of another’ s "warmth" is a powerful determiner in social relationships. Judging someone to be either "warm" or "cold" is a primary consideration, even trumping evidence that a "cold" person may be more capable. Much of this is rooted in very early childhood experiences, Bargh argues, when babies’ conceptual sense of the world around them is shaped by physical sensations, particularly warmth and coldness. Classic studies by Harry Harlow, published in 1958, showed monkeys preferred to stay close to a cloth "mother" rather than one made of wire, even when the wire "mother" carried a food bottle. Harlow’ s work and later studies have led psychologists to stress the need for warm physical contact from caregivers to help young children grow into healthy adults with normal social skills.

Feelings of "warmth" and "coldness" in social judgments appear to be universal. Although no worldwide study has been done, Bargh says that describing people as "warm" or "cold" is common to many cultures, and studies have found those perceptions influence judgment in dozens of countries.

To test the relationship between physical and psychological warmth, Bargh conducted an experiment which involved 41 college students. A research assistant who was unaware of the study’s hypotheses, handed the students either a hot cup of coffee, or a cold drink, to hold while the researcher filled out a short information form: The drink was then handed back. After that, the students were asked to rate the personality of "Person A" based on a particular description. Those who had briefly held the warm drink regarded Person A as warmer than those who had held the iced drink.

"We are grounded in our physical experiences even when we think abstractly." says Bargh.

We can infer from the passage that().

A. abstract thinking does not come from physical experiences

B. feelings of warmth and coldness are studied worldwide

C. physical temperature affects how we see others

D. capable persons are often cold to others