两台罗茨风机的启动时间要间隔()以上,以防止启动电流过大。 A.1秒 B.10秒 C

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问题:

两台罗茨风机的启动时间要间隔()以上,以防止启动电流过大。

A.1秒

B.10秒

C.3分钟

D.10分钟

考点:表活剂装置操作工考试中级表活剂装置操作工中级表活剂装置操作工题库
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As Oil Declines, So does America


More than 100 years ago, America’s first great economic (26) abroad was spearheaded by its giant oil companies, notably John D. Rockefeller’s Standard Oil Company. These companies (27) powerful beachheads in Mexico and Venezuela, and later in parts of Asia, North Africa and, of course, the Middle East. (28) they became ever more dependent on the extraction of oil in distant lands, American foreign policy began to be (29) around acquiring and protecting US oil concessions in major (30) areas.
With World War Ⅱ and the Cold War, oil and US national (31) became thoroughly intertwined. After all, the United States had prevailed over the Axis (32) in significant part because it possessed vast reserves of domestic petroleum, while Germany and Japan lacked them, depriving their forces of vital (33) supplies in the final years of the war. As it happened, though, the United States was using up its domestic (34) so rapidly that, even before World War Ⅱ was over, Washington (35) its attention to finding new overseas sources of crude oil that could be (36) under American control. As a result, Saudi Arabia, Kuwait and a host of other Middle Eastern producers would become key US oil suppliers (37) American military protection.
There can be (38) question that, for a time, American domination of world oil production would prove a potent source of economic and military power. (39) World War Ⅱ, an abundance of cheap US oil spurred the (40) of vast new industries, including civilian air travel, highway construction, a (41) of suburban housing and commerce, mechanized agriculture, and plastics.

A. flood B. flow C. move D. trend

Abundant oil also underlay the global expansion of the country’s (42) power, as the Pentagon defended the world while becoming one of the planet’s great oil guzzlers. Its global dominion came to (43) on an ever-expanding array of oil-powered ships, planes, tanks and missiles. As long as the Middle East—and especially Saudi Arabia—served essentially as an American gas station and oil (44) a cheap commodity, all this was relatively painless. That is why the use of military force has been a (45) of American foreign policy since 1987.

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Find out the words we've learnt. (找出我们学过的单词.)

      walk  _______________________________________

    _____________________________________________

    _____________________________________________

    _____________________________________________

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某企业在决定信息系统的开发方式时,有些模块需要购置现成的商品软件,有些模块要自己开发,以下模块中可以考虑自己开发的是()

A.应收款管理

B.客户订单管理

C.客户档案管理

D.客户开发进程管理

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一些食物的近似pH如下表:

食 物苹 果葡 萄牛 奶玉米粥
pH2.9-3.33.5-4.56.3-6.6 6.8-8.0
人的胃液中含有盐酸,对于胃酸过多的人,空腹时最宜食用上述食物中的[ ]

A.苹果 B.葡萄 C.牛奶 D.玉米粥

题型:单项选择题

重晶石粉常温下密度为4.0~4.6g/cm3

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