题目内容

A transformer can be used for reducing output voltage but also increasing the output voltage. But it’s only on AC. If connect a transformer to DC power supplier the transformer will be over heated

A. 对
B. 错

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Select all electromagnetic devices you have learnt from this unit VU22496

A. SCRs
B. Inductors
Chokes
D. Triac
E. Transformers
F. Solenoids
G. Relays
H. Electric bells and buzzers

Match the following advantageswithac, dc, and step motors

肥育主要以()在体内的沉积为主。

A. 蛋白质
B. 脂肪
C. 矿物质
D. 水

吊架子是形成骨骼和成年体型,最后短时间育肥出栏沉积更多的(),符合动物体组织生长的一般规律。

A. 蛋白质
B. 矿物质
C. 脂肪
D. 水

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