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【简答题】
压力容器可分为工类压力容器，Ⅱ类压力容器：Ⅲ类压力容器3个类别，是根据压力容器的设计压力、容积和（ ）等因素划分的。
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反馈参考答案：
举一反三
【简答题】当一个栅格单元内有多个可选属性值时，可按一定方法来确定栅格属性值，常用的方法有A. 中心点法，面积占优法，重要性法，长度占优法
【单选题】They had a holiday ______ice and snow because they travelled across Greenland.
A.
is full of
B.
is filled with
C.
full of
D.
full with
【单选题】What was people's reaction whey they saw the snow?
A.
They were screaming when seeing the snow
B.
They were so amazed that some stood there staring
C.
They were driven to work
【单选题】What do the simplest snow crystals look like?
A.
They have six columns．
B.
They are flaky．
C.
They are cubic in shape．
D.
They are six—sided．
【单选题】How did the men get their water supply at the South Pole?
A.
They dug out clean snow.
B.
They depended on ships to bring them water supply.
C.
They depended on planes to bring them water supply.
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