草木灰是一种农家肥料，其有效成分是K2CO3，它属于（ ）
对政府权力进行制约和监督要建立健全权力运行的监督体系，这个体系要靠（ ）
若4x2=2x，则x的取值范围是____。
—What was Jim wearing at the party?
—Nothing _______. He was in his usual shirt and jeans.
