【单选题】【消耗次数：1】
若x+y=4，则x与y的等差中项是（）
①
<img src="20190823/1566541693582985.jpg" title="1566541693582985.jpg" alt="图片13.jpg" width="14" height="20"/>
②
<img src="20190823/1566541657151206.jpg" title="1566541657151206.jpg" alt="图片14.jpg" width="16" height="21"/>
③
<img src="20190823/1566541665933811.jpg" title="1566541665933811.jpg" alt="图片12.jpg" width="17" height="45"/>
④
<img src="20190823/1566541670603375.png" title="1566541670603375.png" alt="图片2.png" width="17" height="45"/>
参考答案：
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最重要并常用的形态指标是（ ）和（ ）。<img class="questionIndex" data-index="1" src="/common/images/question_button/BlankSpace1.gif"/><img class="questionIndex" data-index="2" src="/common/images/question_button/BlankSpace2.gif"/>
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