电液式各种主动式减摇装置的控制原理是()。a.敏感元件感受的船舶摇摆信号;b.控制机

题型:单项选择题

问题:

电液式各种主动式减摇装置的控制原理是()。

a.敏感元件感受的船舶摇摆信号;

b.控制机构将信号放大;

c.推动减摇机构动作,产生减摇力矩;

d.动力元件的伺服机构输出必要的功率。

A.a→b→c→d

B.a→b→d→c

C.a→d→b→c

D.a→c→b→d

考点:船舶管理(轮机长)船舶推进装置工况配合特性及管理船舶推进装置工况配合特性及管理题库
题型:单项选择题

Imagine the following scene: on the grasslands, an elephant stands under an umbrella-like tree.   shadow(影子) grows long and thin. In the distance, you can also see a few zebras running here and there. Such a scene is commonplace in the magical continent of Africa.

Africa is the second largest continent in the world. To its southeast      the Indian Ocean, and toward the west is the Atlantic Ocean. It is also the continent with the world’s second largest population (more than 1 billion) behind Asia.

The continent is       to the world’s tallest animal, giraffes. People can also find crocodiles (鳄鱼) and hippos (河马) in grassland and rainforests.

Africa is great to visit. In east Africa, Mount Kilimanjaro stands 5,895 meters into the sky. It is the highest point in the continent.        it lies in the tropics (热带), it is covered with ice and snow year-round.

The continent       its hundreds of ethnic (种族) groups. The three largest ethnic groups are the Hausa, Igbo and Yoruba. They are all in west Africa.

Although many places in Africa are poor, this is not the whole picture. South Africa is the       country in Africa. Some parts of the country are wealthy. Modern and well-developed roads are common everywhere. You can also spend a day in a large shopping mall or taste delicious seafood in a restaurant.

小题1:

A.It’s

B.Its

C.Their

D.His

小题2:

A.lies

B.faces

C.stands

D.has

小题3:

A.space

B.area

C.home

D.nest

小题4:

A.Since

B.Though

C.While

D.Because

小题5:

A.is proud of

B.is interested in

C.is made of

D.is famous for

小题6:

A.oldest

B.biggest

C.richest

D.poorest

题型:单项选择题

在生活中我们未成年人的合法权益经常受到侵害,当我们受到非法侵害时[ ]

①坚决用武力进行报复

②运用法律武器维护自己的合法权益

③向有关部门反映,寻球帮助

④忍气吞声,自认倒霉

A.②④

B.②③

C.①②

D.①④

题型:单项选择题

所谓的“现代化”,是用高科技去保存一个民族最珍贵、最重要的东西,而不是适得其反地将过去连根拔起,慌忙移植一个外国的东西。所有对文化的保存都不是单纯为了缅怀过去,恰恰是为了未来,因为没有过去的人必然失去未来。

这段文字主要是强调()。

A..在未来的发展离不开民族文化的重塑

B.运用高科技保存民族文化的意义

C.保护文化对民族未来发展的价值

D.民族文化应如何面对多元文化的冲击

题型:单项选择题

非金属风管宜以外径还是内径为标注尺寸?

题型:单项选择题

列检作业场对长大货物车进行技术作业时,只负责()、制动装置、车钩缓冲装置、车体及底架的技术检查,其他机械、液压等部分由()负责检查。

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