道岔中心 center of turnout

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• Which of the following is a characteristic of a data center core？（）

  A .  Server-to-server traffic always remains in the core layer. B .  The recommended practice is for the core infrastructure to be in Layer 3. C .  The boundary between Layer 2 and Layer 3 should be implemented in the aggregation layer. D .  The Cisco Express Forwarding hashing algorithm is the default， based on the IP address andLayer 4 port. E .  Core layer should run BGP along with an IGP because iBGP has a lower administrativedistance than any IGP.

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• 道岔主线 main line of turnout

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• 线路中心线 center line of track

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• Which of the following will increase the height of the center of buoyancy for your vessel?（）.

  A . Discharging weight from lower decks B . Loading weight in upper decks C . Shifting weight from lower to upper decks D . Shifting weight from upper to lower deck

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• The geometric center of the waterplane area is called the（）.

  A . center of buoyancy B . center of gravity C . metacenter D . center of flotatio

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• 道岔导曲线 lead curve of turnout

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• A crankshaft whose center of gravity coincides with its center line is said to be （）.

  A . dynamically balanced B . statically balanced C . counter balanced D . resonantly balanced

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• 对开道岔 symmetrical turnout

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• 三开道岔 three-throw turnout

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• The center of flotation of a vessel is（）.

  A . the center of volume of the immersed portion of the vessel B . the center of gravity of the water plane C . that point at which all the vertical downward forces of weight are considered to be concentrated D . that point at which all the vertical upward forces of buoyancy are considered to be concentrated

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• Stability is determined principally by the location of the center of gravity and the（）.

  A . aft perpendicular B . center of buoyancy C . keel D . center of flotatio

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• 道岔侧线 siding of turnout

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• The center of buoyancy and the metacenter are in the line of action of the buoyant force（）.

  A . only when there is positive stability B . only when there is negative stability C . only when there is neutral stability D . at all time

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• A crankshaft whose center of gravity coincides with its center line is said to be（） Ⅰ.statically balanced Ⅱ.dynamically balanced

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ nor Ⅱ

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• The center of flotation of a vessel is the point in the waterplane（）.

  A . about which the vessel lists and trims B . which coincides with the center of buoyancy C . which，in the absence of external forces，is always vertically aligned with the center of gravity D . which is shown in the hydrostatic tables as VCB

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• The center of volume of the immersed portion of the hull is called the（）.

  A . center of buoyancy B . center of flotation C . center of gravity D . tipping center

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• Stability is determined by the relationship of the center of gravity and the（）.

  A . water depth B . keel C . center of flotation D . center of buoyancy

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• 道岔中心线表示法 method of indicating the center line of turnout

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• The center of the underwater volume of a floating vessel is the（）.

  A . center of buoyancy B . center of flotation C . uncorrected height of the center of gravity of the vessel D . center of gravity of the vessel corrected for free surface effect

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• 单车道岔 simple turnout

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• 原文:欢迎参观开罗国际会议中心。该会议中心是中国政府赠送给埃及政府的礼物,是中埃两国人民友好的象征。译文:Welcome to _______. The conference center is a gift to the Egyptian government from the government of China. It is a symbol of friendship between ______________.

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• Find the center and vertices of the ellipse. （）

  A．center: vertices: B．center: vertices: C．center: vertices: D．center: vertices: E．center: vertices:

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• The__ study of religion moved from the center to the periphery of sociology（）

  A．physical B．psychological C．professional D．sociological

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• We collected hundreds of（）in support of not allowing cars into the city center

  A．signatures B．awareness C．stationery D．statements

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