试验灰分时所用坩埚应用()进行浸泡煮沸。
A.盐酸(1∶4)
B.盐酸(4∶1)
C.硝酸(1∶4)
D.硝酸(4∶1)
参考答案:A
图1反映了商鞅变法的哪项措施?
A.奖励军功
B.奖励耕织
C.推行县制
D.废井田,开阡陌
18.Development of economy ______ which our country attaches great importance, has drawn the attention of the whole world.
A.with
B.for
C.to
D.in