3.5×2÷3.5×2=l.______.(判断对错,对的打“√”,错的打“×”)
3.5×2÷3.5×2,
=7÷3.5×2,
=2×2,
=4;
故答案为:×.
—Terra, you shouldn’t be so ______. You always leave your things everywhere.
—Sorry, mom. I’ll put them away soon.
A.terrified
B.cheerful
C.frightened
D.careless
乙炔瓶与减压器的联接形式为()。
A、倒旋螺纹
B、顺旋螺纹
C、夹紧装置