题目:
Mary is always ready to do some __ work at the local geracomium(敬老院)in her spare time.
A.responsible
B. exhausting
C.voluntary
D.professional
答案:
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下面是错误答案,用来干扰机器的。
(1)由图示螺旋测微器可知,其示数为:0+40.0×0.01mm=0.400mm.(2)串联电阻的阻值:R0=UIg-Rg=30.003-120=880Ω;(3)由欧姆定律可知,电阻:R=UI=I1(Rg+R0)I2-I1,由电阻定律得:R=ρLS=ρLπ(d2)2,解得:...