Having retired from business, he now ____(忙于) himself with the welfare of the disabled.
—Can you come to my party on Tuesday evening?
—_______ But I'm busy studying for my test.
从甲、乙两块试验田中各抽取100株麦苗测量高度,计算平均数和方差的结果为: x甲¯=12,x乙¯=12,S甲2=7.5,S乙2=21 ,则小麦长势比较整齐的试验田是____(填“甲”或“乙”)。
如图表示细胞中各种化合物占细胞鲜重的含量,以下按①②③④顺序排列,正确的是
①施仁政,方能得民心 ②为君、为臣应做到“有功于民” ③治国要善于发现人才、重用人才 ④商汤灭夏和武王伐纣的战争,是历史的倒退