试题与答案

下列说法正确的是()①木块放在桌面上要受到一个向上的弹力,这是由于木块发生微小的形变

题型:单项选择题

题目:

下列说法正确的是()

①木块放在桌面上要受到一个向上的弹力,这是由于木块发生微小的形变而产生的

②拿一根细竹竿拨动水中的木头,木头受到竹竿对它的弹力,是由于木头发生形变而产生的

③绳对物体的拉力方向总是沿着绳而指向绳收缩的方向

④挂在电线下面的电灯受到向上的拉力,是因为电线发生微小形变而产生的

A.①②

B.③④

C.①②③

D.①②③④

答案:

参考答案:B

试题推荐
题型:单项选择题

A 6-week-old female infant exhibits dry scaly skin and a protruding tongue after having trouble breast-feeding. A diagnosis of congenital hypothyroidism is made. The mother asks the nurse why the child was not diagnosed with this condition at birth. Which of the following would be the nurse’s best response

A. "We had the results of the newborn screen, but you did not bring the baby in for the 2-week checkup. "
B. "We could not reach you at home to give you the results of tests taken at birth. "
C. "Your baby had little need for thyroid hormone until she was 1 month old. "
D. "Newborns generally receive enough thyroid hormone from the mother to get by the first few weeks. "

查看答案
微信公众账号搜索答案