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问题 填空题

某同学站在清澈的河边看到河底的石头，他看到的是石头的______像（填“虚”或“实”），像的位置比石头的实际位置______一些（选填“高”或“低”）．

答案

从水面上看水中点A的像A′的位置，如图所示：

根据图解，石头反射的光线斜射到水面发生折射，折射角大于入射角，石头的像在折射光线的反向延长线A′上，成的是虚像，位置在真实石头的上方．

故答案为：虚像、高．

单项选择题

A 19-year-old primigravida is admitted to the labor and delivery unit in labor. She’s 2 cm dilated and 50% effaced, and the fetal head is at 0 station. She’s having moderately p 40-second contractions every 5 minutes. She seems rather anxious and becomes very tense during each contraction. When the client asks for pain relief, what should the nurse do next

A. Determine the source of her anxiety and institute interventions to help her relax.
B. Immediately check the physician’s order and give her the analgesic ordered.
C. Inform her that the neonate’s head isn’t down far enough just yet but that, as soon as it is, medication will be given.
D. Tell her that her contractions are only moderately p and that she should wait until later to take medication.
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解答题

列式计算

（1）一个数的1.5倍比4.6多5.9，求这个数．（用方程解）

（2）5.4与6.6的和除以0.25的商，减去0.85，差是多少？

（3）5与2.6的乘积加上一个数的2倍是58.5，求这个数？
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