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面色缘缘正赤

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在强风作用下，火势可以越过低矮的建筑物，点燃较高的建筑，出现（）燃烧，它的出现往往使灭火力量腹背受敌，可能烧伤人员。

A. 跳跃式
B. 大面积
C. 直线式
D. 迅速

Write a memo in about 50 words. You are a department manager. A new copying machine has been installed in your department. Write a memo to tell your staff members to be careful in using the newly-installed photocopier. Your instructions should include the following particulars: ·Ask them not to use it for too long at a time. ·Ask them to switch off the machine after use. ·Encourage them to offer suggestions for the care of the machine.

半个蚕茧的发掘地为？（）

A. 河南商丘
B. 山西运城
C. 浙江绍兴

系统模型分为逻辑模型和（）。