题目:
某足球场需铺设草皮,现有正三角形、正四边形、正五边形、正六边形、正八边形、正十边形6种形状的草皮,请你帮助工人师傅选择两种草皮来铺设足球场,可供选择的两种组合是______.
答案:
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参考答案:B解析:The pelvic tilt exercise, which can be done standing as well as lying down, can greatly relieve back discomfort. As the pregnancy progresses into the last...