A:大脑
B:小脑
C:脑干
D:脊髓
①铁架台②烧杯③量筒④试管夹⑤石棉网⑥集气瓶⑦药匙⑧胶头滴管⑨托盘天平⑩砝码.在这10种仪器中,实验中一定不需要是(填编号)____;需要增加的仪器是____.
Security devices at airports are ______ to spot weapons that could be used by terrorists.
是一元一次方程的是( )