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搜题
【单选题】
短暂性抽动障碍的病程
A.
小于3个月
B.
小于6个月
C.
小于12个月
D.
大于12个月
E.
大于24个月
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【简答题】Many of us already know about several American superstitions(迷信). Having a black cat cross your path, walking under a ladder, and breaking a mirror are all bad luck. In addition to these, there are ma...
【简答题】将下列句子翻成汉语,注意专业词汇的翻译。 1 After we have checked the L/C carefully,we request you to make the following amendment: “Partial Shipments and Transshipment Allowed.” 2 A particular average loss under 3% of th...
【多选题】在 元件串联的电路中,已知 , , ,电源电压 。(1) 求电流的有效值I;(2) 求电路功率因数 ;(3) 求各部分电压的有效值。 根据解题步骤,正确选择答案。
A.
解 : (1) (1)
B.
C.
D.
(2) (A)
E.
(2) (A)
F.
(3) (V) (V) (V)
G.
(3) (V) (V) (V)
【多选题】釆取下面卿些措施可以降低套管式温度计的测量误差
A.
套管式温度汁向来流方向倾斜
B.
采用铜代替铁作为套管材料
C.
降低套管温度汁的壁厚
D.
提高测量流体的来流速度
【单选题】We _____ more than 1,200 English words already, do you know?
A.
learn
B.
will learn
C.
have learned
D.
are learning
【简答题】在R、L、C元件串联的电路中,已知【图片】,【图片】,【图片】,电源电压【图片】V,则电路中电流的有效值为( )A.(保留一位小数)
【多选题】在 元件串联的电路中,已知 , , ,电源电压 。(1) 求感抗、容抗和阻抗;(2) 求电流的有效值 与瞬时值 的表达式。 根据解题步骤,正确选择答案。
A.
解 : (1)
B.
C.
D.
(2) (A)
E.
(A)
F.
(2) (A)
G.
(A)
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A.
50Ω
B.
70Ω
C.
10Ω
D.
22Ω
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