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【简答题】
ABB机器人的TCP是工具工作点，默认是 [填空(1)] A. 第6轴法兰盘中心
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举一反三
【简答题】在图7-32所示电路中，已知：R1=R3=4kΩ，R2=2kΩ，C=2μF，U=20V，换路后电容电流iC的变化规律是（ ）mA。
【单选题】电路如图7－31(a)所示，已知R1=10Ω，R2=20Ω，uC(0一)=0，电路在t≥0暂态过程中，电容电压的变化曲线是图7－32(b)中的( )。
A.
B.
C.
D.
【单选题】English ＿＿＿more and more widely (广泛) today. So we must learn it well.
A.
uses
B.
used
C.
is used
【简答题】在图2-32所示电路中,R1 = 2Ω,R2 = 3Ω,E = 6V,内阻不计,I = 0.5A,当电流从D流向A时:UAC = 、UDC = ;当电流从A流向D时:UAC = 、UDC = 。
【单选题】We can infer from the passage that .
A.
children today seem to be more obedient to their parents
B.
children in the 1970s enjoyed more freedom than those today
C.
the author became overprotective under the influence of her mother
D.
the social security back in the 1970s was no better than it is today
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