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【单选题】
( )是对按重量供货或以重量为计量单位的商品,作数量验收时的称重。A.
计件
B.
检尺
C.
求积
D.
检斤
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【单选题】(Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).
A.
Even though
B.
has been studying
C.
to the United States
D.
to express himself
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【简答题】已知电路如图a所示，R 1 =1Ω，R 2 =2Ω，R 3 =3Ω，R 4 =4Ω，R L =5Ω，U S =15V，试用戴维南定理求电阻R中的电流I。
【简答题】电路如图所示。已知 RL= 5Ω,试求电路中的电流 I 。
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