为防止入侵波通过主变耦合威胁发电机,在()上装设一组避雷器。
参考答案:发电机封闭母线
属于中等危险性物品的是()
A.2ml空针
B.压舌板
C.痰盂
D.腹腔镜
E.听诊器
89. Was this piece of earthenware(陶器) made machine or _____ hand?
A.by; by
B.with; by
C.with; with
D.by; with