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单项选择题

积层式电路板为什么是对称的？

A．为了美观
B．为了避免热膨胀系数不同引起的变形
C．对称电路板交流特性好
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影响某城市建筑日照的因素中，下列哪项论述是较全面的？Ⅰ.纬度Ⅱ.经度Ⅲ，海拔Ⅳ.太阳高度角Ⅴ.太阳方位角( )
A.Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ
B.Ⅰ、Ⅳ、Ⅴ
C.Ⅰ、Ⅲ、Ⅳ、Ⅴ
D.Ⅳ、Ⅴ
单项选择题
 Mr. H is a 24-year-old man who resides in a skilled nursing facility,
where he is undergoing rehabilitation from a cervical spine injury.
The injury left him quadriplegic. He has normal cognitive function
and no problems with respiration. He is admitted to your service for
treatment of pneumonia. The resident suggests antibiotics, chest
physiotherapy, and hydration. One day while signing out Mr. H to the
cross covering intern, the intern says "he should be a DNR, based on
medical futility."
How would you respond to the intern?
多项选择题
肝素抗凝血作用的机制有（　　）。
A.抑制因子Ⅴ的激活
B.促进纤溶酶原的激活
C.增强抗凝血酶活性
D.促进组织因子途径抑制物的释放
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