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【简答题】
RLC串联电路,其中R=30 Ω, L=382 mH, C=39.8 μF, 外加电压u=220√2sin(314t+60°)V,试求:1复阻抗Z,并确定电路的性质;2 ;3绘出。
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举一反三
【单选题】听力原文：W: What's all this glass doing on the floor? M: Look at the window and you'll see. The kids were playing basketball and Tommy failed to catch it. Q: What do we learn from the conversation? (3)
A.
Tommy fell to the ground and broke his glasses.
B.
The window was broken by the kids.
C.
The kids were playing with the glasses.
D.
Tommy failed in the basketball game.
【单选题】下列的市场类型中,对厂商数目的排序正确的是( )
A.
完全竞争>寡头垄断>垄断竞争
B.
垄断竞争>寡头垄断>完全垄断
C.
寡头垄断>垄断竞争>完全竞争
D.
完全垄断>寡头垄断>完全竞争
【简答题】生命的基本特征是 、 、 、和 。
【简答题】SQL
Server 2016 是一个( )的数据库系统。 A:网状型;B:层次型;C:关系型;D:以上都不是;A. 网状型 B. 关系型 C. 层次性 D. 非关系型
【单选题】During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
A.
the highest
B.
above 3/4
C.
1/2 -3/4
D.
the lowest
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