看拼音,写词语。
zhāo xiá
bō làng
shuì mèng
chèn zǎo
péi bàn
luò rì
____
一个弹簧挂30N的重物时,弹簧伸长1.2cm,若改挂100N的重物时,弹簧的总长度为20cm,则弹簧的原长为 ( )
下图是实验室制溴苯的装置图,下列说法正确的是( )
例:A:Jenny often walks to school.
B:Jenny walked to school yesterday.
C:Jenny is going to walk to school tomorrow.