单项选择题

渐变焦镜片移心是指移动（）。
A、棱镜基准点
B、配适点
C、远用基准点
D、近用基准点

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With which following statement would Asimov likely agree? A、Children in the future learn much faster B、Going school with other kids makes learning enjoyable C、Schools in old days offered an education of poor quality D、Mechanical teachers teach much better than their human counterparts
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三相电路中，当三角形负载对称时，以下描述正确的是（ ）。
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