搜题请搜索小程序“爱下问搜题”
问题 选择题

对任意实数x，点P（x，x2-2x）一定不在（　　）

A．第一象限

B．第二象限

C．第三象限

D．第四象限

答案

（1）当0＜x＜2时，x＞0，x2-2x=x（x-2）＜0，故点P在第四象限；

（2）当x＞2时，x＞0，x2-2x=x（x-2）＞0，故点P在第一象限；

（3）当x＜0时，x2-2x＞0，点P在第二象限．

故对任意实数x，点P可能在第一、二、四象限，一定不在第三象限，故选C．

问答题 简答题

创造第一批人类的神是？
查看答案
单项选择题

A 58-year-old client on a mental health unit has lost control, despite having been properly medicated, and is threatening to harm himself and others. He has been placed in four- point restraints. Which nursing measure should be taken next（）

A. Release one restraint every 15 minutes.

B. Have a staff member stay with the client at all times.

C. Leave the client alone to reduce his sensory stimulation and allow him to regain control.

D. Restrict fluids until the restraint period is over.
查看答案