由主表手动控制,切换至串级手动控制的方法是:副表()、控制输出切换到副表、副表投自动

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问题:

由主表手动控制,切换至串级手动控制的方法是:副表()、控制输出切换到副表、副表投自动

A、手动对阀位

B、投外给定

C、投内给定

D、投手动

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B

The largest earthquake (magnitude里氏9.5 ) of the 20th century happened on May 22, 1960 off the coast of South Central Chile.

It generated (生成) one of the most destructive Pacific-wide tsunamis (海啸). Near the

generating area, both the earthquake and the tsunami were very much destructive, particularly in the coastal area from Concepcion to the south end of Isla Chiloe. The largest tsunami damage occurred at Isla Chiloe-the coastal area closest to the epicenter(震中). Huge tsunami waves measuring as high as 25 meters arrived within 10 to 15 minutes after the earthquake, killing at least two hundred people, sinking all the boats, and flooding half a kilometer inland.

There was large damage and loss of life at Concepcion, Chile’s top industrial city. Near the city of Valdivia, the earthquake and following aftershocks generated landslides which killed 18 people. At the port city of Valparaiso, a city of 200,000, many buildings collapsed. A total of 130,000 houses were destroyed--one in every three in the earthquake zone and nearly 2,000,000 people were left homeless.

Total damage losses, including to agriculture and to industry, were estimated(估计) to be over a half billion dollars. The total number of deaths related with both the tsunami and the earthquake was never found accurately for the region. Estimates of deaths reached between 490 to 5,7002 with no distinction(差别) as to how many deaths were caused by the earthquake and how many were caused by the tsunami. However, it is believed that most of the deaths in Chile were caused by the tsunami.

What is the total number of deaths in the earthquake().

A. 2,000,000.

B. Between 490 to 5,7002.

C. 200,000.

D. It was hard to know.

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采取相应措施使软基表层或内部形成水平或垂直排水通道,然后在土壤自重或外荷压载作用下,加速土壤中水分的排除,使土壤固结的一种方法是( )。

A.固结法

B.挤实法

C.排水法

D.置换法

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羚羊角片入汤剂时应()

A.先煎

B.后下

C.包煎

D.另煎

E.与诸药同煎

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需求分析最终结果是产生( )。

A.项目开发计划

B.需求规格说明书

C.设计说明书

D.可行性分析报告

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下列哪些活动属于条件反射()

A、看到酸梅时引起唾液分泌

B、食物进入口腔后,引起胃腺分泌

C、大量饮水后尿量增加

D、寒冷环境下皮肤血管收缩

E、炎热环境下出汗

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