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【单选题】
影响轨道电路调整状态的因素中不包括（）。A.
钢轨阻抗
B.
道碴电阻
C.
送电端电源电压
D.
分路灵敏度
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反馈参考答案：
举一反三
【单选题】What does the man mean?
A.
His wife likes roses.
B.
His wife is younger than him.
C.
It's impossible to keep a long-time marriage fresh.
【单选题】What is the teacher doing in terms of error correction?S1:My brother is younger than my sister. How about yours?S2:My brother is older as my sister.T:Er … (questioning look)S2:Er … (pause) Oh yes, old...
A.
Helping self-correction
B.
Encouraging peer correction
C.
Conducting teacher correction
D.
Employing indirect correction
【单选题】在纯电感电路中,已知i= sin(100t-π/6)A,X L =10Ω,则电路中的电压解析式为( )。
A.
10V
B.
10 V
C.
u=10 sin(100t+π/3)V
D.
u=20 sin(100t-π/6)V
【简答题】在纯电容电路中，已知u=10sin（100t+30°）V，C=20μF，，则该电感元件的感抗X C =（）Ω，流经电容元件的电流I=（）A，电容的有功功率P=（）W。
【简答题】在纯电感电路中，已知u=10sin（100t+30°）V，L=0.2H，则该电感元件的感抗X L =（）Ω，流经电感元件的电流I=（）A，电感的有功功率P=（）W。
【单选题】在纯电感电路中,已知u=10 sin(100t+π/2)V,X L =2Ω,则电路中的电流解析式为( )。
A.
5A
B.
5 A
C.
i=5 sin(100t+π/2)A
D.
i=5 sin100tA
【单选题】What is younger than the mountains in Country Road, Take me Home?
A.
life
B.
the trees
C.
the river
D.
heaven
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