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【单选题】
RLC并联电路,已知R=2Ω,L=4H,C=10F,则当该RLC并联电路处于谐振状态时,其等效阻抗为( )ΩA.
1.5
B.
2
C.
2.5
D.
1
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举一反三
【单选题】患者,男,18岁。因外伤造成右臂肱骨中段骨折而急诊人院。检査发现患侧第12掌骨间隙背面“虎口区”感觉消失,抬前臂时呈“垂腕”状态,其原因可能是骨折伴有
A.
尺神经损伤
B.
肌皮神经损伤
C.
正中神经损伤
D.
桡神经损伤
E.
腋神经损伤
【简答题】Although the two players are in the tennis court, they are really good friends ________. A) partners B) enemies C) D) companions
【多选题】下列关于三相异步交流电动机的叙述中，正确的有______。
A.
三相异步电动机可以通过改变转差率进行调速
B.
直接起动的电流约为额定电流的5～7倍，电动机严重过热，以致烧坏
C.
电动机在额定电压下起动称为直接起动
D.
直接起动的电路中，不需要时间继电器
E.
大功率的三相交流异步电动机可以采用星形—三角形降压启动
【单选题】The two friends are ________ related like the lips and teeth, and you can often see them stay ________ together, hand in hand
A.
close; close
B.
close; closely
C.
closely; close
D.
closely; closely
【简答题】Two friends are having a picnic together. 36 names are Jack and Tim. Tim is very lazy (懒的) . 37 the first evening of their holiday, Jack says to Tim, “Here’s some money. Go and buy some meat.” “I’m to...
【简答题】The two friends are quite _______ each other. (commit)
【简答题】The two friends are _________ with each other in the corner.
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