2021-2022 英语周报 高一 HZ 6答案

17.C【解析】把图甲所示半圆环等分为两半,即每段为一圆环,每段在O1点的电场强度为E,且方向分别与E0夹角为0=45°,根据电场强度的叠加原理可知E。方向垂直于虚线,E==E0。因为电势是标量,每段导体在O1上的电势为g=2。同理,图乙所示圆环可等分为3个4圆环,根据场强叠加可知O2处的场强大小为E。,电势为3个圆环在O2点的电势之和,为290。所以只有选项C正确。

As we all know, plastic doeseaterharm. to the envireatronment. It can also enter into our bodies and cause seriousdamages to our health. Last week our class did the surveydamageappyto learn about peoples plastic habitsappi, all thepeople interviewed said they knew the importance of environmental protection that they were taking action. Butto their disappointment, we found there were still manypeople.using plastic bags while shopping. So we managed∧buy some cloth bags with our pocket money and thnengiveavethem away to people

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