问题 不定项选择

如图所示,升降机的底板上放一台秤,台秤上放一物体,当升降机匀速运动时,台秤的示数为10 N;现在台秤的示数突然变为12 N,则升降机可能做的运动是

[ ]

A.加速上升

B.加速下降

C.减速上升

D.减速下降

答案

AD

写句子

按要求改写句子。   

1.改成感叹句。

    (1)曹冲称象的办法想得奇妙。

                                                                                                                 

    (2)王二小是我们中国人的骄傲。

                                                                                                                 

2.改成“把”字句和“被”字句。

    (1)孩子接过去了妈妈手中的水桶。

                                                                                                                  

                                                                                                                  

    (2)冰雹砸伤了小鸟的翅膀。

                                                                                                                  

                                                                                                                  

单项选择题