水作为淬火介质有何优缺点?

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问题:

水作为淬火介质有何优缺点?

考点:钢材热处理工考试钢材热处理工初级钢材热处理工初级题库
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Are you interested in seeing the beautiful fall foliage of New England but tired of traffic jams and overbooked hotels Then this year forget the crowds in New England and see the beautiful colors of autumn in the Catskills.
These rugged mountains in New York State, just 90 miles northwest of New York City, are famous for the legendary tales of Rip Van Winkle, and more recently for the summer hotels mat sprang up in the region during the 1940s, 1950s, and 1960s. Families trying to escape the heat of New York City found the Catskills to be the perfect place to stay for a month or so each summer. By the late 1950s there were over 500 resorts and hotels offering nighttime entertainment as well as all kinds of outdoor activities. Famous comedies like Jackie Gleason, Joan Rivers, and Sid Caesar all got their start touring the hotel clubs here. Since the introduction of air-conditioning and cheaper air travel, however, families have stopped coming to the Catskills in such large numbers, chasing instead more distant locations at different times of the year. Many of the Catskills hotels closed in the 1970s, but some remain and have expanded and changed their facilities to meet the needs of today’s visitors.
Currently, there are many activities available to the traveler besides witnessing the changing colors of the leaves. There is an all-organic sheep farm where visitors can see how a traditional sheep farm operates. There are also hundreds of miles of scenic drives in the area. Route 42, for instance, is an excellent site for spotting bald eagles. For more information on vacations in the Catskills, call the office of Public Information.

From the passage, what might a visitor be lucky enough to do

A.See fall leaves in color.

B.See a kind of bird.

C.Work on a sheep farm.

D.Drive on scenic roads.

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通过授权,以下()可以重复打印

A、清算发报记账补充凭证

B、清算发报报文清单

C、清算收报报文清单

D、清算收报摘要

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什么是曲轴?它是作用是什么?

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不必客气,需要什么______我说一声。

A.于
B.打
C.往
D.跟

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尾气压缩机的一般采用是()。

A、离心压缩机

B、往复压缩机

C、螺杆压缩机

D、液环式压缩机

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