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简述传染性皮下与造血组织坏死病的症状和病理变化。

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影片在单位面积上能承受较多的辐射通量，则说明它的（）。

A. 负载
B. 热负载
C. 负荷
D. 热负荷

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在处理遇卡事故上提电缆时，人员应撤离的安全距离是多少？

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在Windows XP“显示属性”中的“外观”选项卡中，改变“颜色”选项则改变（）。

A. 屏保的背景颜色
B. 网页的背景颜色
C. 桌面的背景颜色
D. 当前窗口的背景颜色

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（）of the following statements is INCORRECT regarding a fire and boat drill on board your cargo vessel.

At least one fire and boat drill shall be held within 24 hours of leaving a port where more than 25 percent of the crew has been replaced
B. The Master is responsible in seeing that each lifeboat is lowered to the water at least once in each 6 months
C. Lifeboat equipment shall be examined at least once each month to insure that it is complete
D. An entry shall be made in the vessel's Official Logbook relative to each fire and boat drill

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