A:doesn’t it
B:isn’t it
C:haven’t you
D:hasn’t it
为了防止电路中电流过大,发生危险,电路中常常要安装保险丝,保险丝是用 ____大,熔点低的铅锑合金制作的,新建楼房用空气开关代替了保险丝,如图所示,当电路中电流过大时,电磁铁的磁性将变 ____(选填“强”或“弱”),吸引衔铁,使衔铁转动,闸刀在弹力作用下自动开启,切断电路,起到保险作用.
Restaurant
Feature(特征)
Sea House
It is ____but ____
Hometown Restaurant
It has ____
Friends Restaurant
It is ____ but has ____