A:to examine; wear
B:to examine; to wear
C:to be examined; to wear
D:examining ; wearing
“黄金有价、玉无价”,某一种玉石的主要成份是NaAlSi2O6,下列说法正确的是( )
芜湖地处长江中下游,水资源丰富,素有“江南水乡”之美称.据测量,仅浅层地下水蕴藏量就达56000万m3,用科学记数法记作( )