天然气的爆炸下限是体积浓度(),爆炸上限是体积浓度()。

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问题:

天然气的爆炸下限是体积浓度(),爆炸上限是体积浓度()。

考点:输气工考试输气工高级输气工高级题库
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生活中常见的下列物质中,属于纯净物的是

A.蒸馏水

B.食盐

C.酱油

D.陈醋

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患者,男,48岁,结肠癌术后要求镇痛,拟硬膜外给予吗啡。

术后最需要的监测为()。

A.血压

B.心率

C.血氧饱和度

D.心电图

E.尿量

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等高线是地面上__________相等的___________的连线。

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()是人类文明史上第一次利用火将一种物质改变成另一种物质的伟大创举,以(生)为标志,人类亦结束了上百万年的狩猎生活而开始农耕和定居。

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Washington: The Bush administration has ________for the first time that it may be willing to ________a multinational force in Iraq to operate under the ________of the United Nations as long as ________by an American. The idea was described by Richard L. Armitage, the deputy secretary of state, as just "________" in discussions at the United Nations. It was first ________publicly last week by Kofi Annan, the United Nations’’ secretary general.Mr. Armitage’’s remarks, made ________to regional reporters and released by ________today, represent ________in course for the administration, which has until now insisted that all ________matters in Iraq remain under total American control. Allowing the United Nations ________would be intended to win the support of the Security Council for ________authorizing the ________ occupation of the country.In his remarks, Mr. Armitage ________to discuss the plans________, saying, "I don’’t think it helps to ________publicly right now." But he described the arrangement under consideration as "a multinational force________" in which "the American would be the U.N. commander."On Monday, Defense Secretary Donald H. Rumsfeld was asked whether he could ________American troops fighting_______. His answer: "I think that’’s not going to happen." But he went on to rule out only "________" meaning by the United Nations, whose troops wear blue helmets over a peacekeeping force in Iraq.

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