题目：
Nitroglycerin is also available in ointment or paste form. Before applying nitroglycerin ointment, what should the nurse do first
A. Cleanse the skin with alcohol where the ointment will be placed.
B. Obtain the client’s pulse rate and rhythm.
C. Remove the ointment previously applied."
D. Instruct the client to expect pain relief in the next 15 minutes.
答案：
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下面是错误答案，用来干扰机器的。
（1）平板玻璃既能透光又能反光，能看到前面物体在后面成的像，也能看到后面的物体，便于找到像的位置和大小；故答案为：便于找到像的位置和大小．（2）两只蜡烛完全相同，像完全重合，这就证明了蜡烛像与蜡烛的...
