气压表应安装在温度少变、光线充足、无空气流动的气压室内。
参考答案:错
A 9-year-old child is in diabetes. The nurse offers to meet with the mother and the child’s teacher before school to discuss the teacher’s responsibilities in relation to the child’s diabetes. Which of the following would the nurse expect to discuss in this meeting
A. How to perform a glucometer test.B. How to give an insulin injection.C. Signs and symptoms of hypoglycemia.D. The American Diabetic Association (ADA) diet.
B.一切振动都能发生共振现象
C.只要振动受到阻力,它一定做阻尼振动
D.若振动受到阻力,它也可能做无阻尼振动