下列说法中不正确的是( )
A.图A中大人提一桶水和两个小孩共同提这桶水静止不动,他们的力对水桶的作用效果相同
B.图B中由甲、乙两图可看出:抽水机能提供水压,电源能提供电压
C.图C中电磁铁吸引大头针的多少反映了电磁铁磁性的强弱
D.图D中的实验装置可以探究灯泡消耗的功率与电流的定量关
D。
D中的装置是通过移动铅笔芯上的滑片来改变电路中的电阻,从而控制灯泡的亮或暗的,它只是定性说明灯泡电功率的变化情况,不能说明电功率与电流的定量关系。
下列说法中不正确的是( )
A.图A中大人提一桶水和两个小孩共同提这桶水静止不动,他们的力对水桶的作用效果相同
B.图B中由甲、乙两图可看出:抽水机能提供水压,电源能提供电压
C.图C中电磁铁吸引大头针的多少反映了电磁铁磁性的强弱
D.图D中的实验装置可以探究灯泡消耗的功率与电流的定量关
D。
D中的装置是通过移动铅笔芯上的滑片来改变电路中的电阻,从而控制灯泡的亮或暗的,它只是定性说明灯泡电功率的变化情况,不能说明电功率与电流的定量关系。
完形填空。 | ||||
Bob and Jane are 1 They live in a small house. The house is 2 a busy street Near their house 3 a supermarket. There are four people in the family: Bob, Jane, their father and their mother. Their father is a worker. He 4 a factory not far 5 their house. Their mother is 6 home. She is a housewife (家庭主妇). Bob and Jane go to school every day. They are 7 . And they go to movies 8 . Bob likes sports. He likes swimming and playing soccer. After school he often plays soccer 9 his classmates. Jane is a good girl. After school, she often goes home to help her mother 10 the housework. | ||||
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