500×(1-15),
=500×45,
=400(吨);
答:还剩下了400吨没用.
下列哪项是市级购物中心的典型特征()。
A.建筑规模一般在1万~3万m2之间
B.服务人口在1万~5万人之间
C.年营业额在1亿~5亿元人民币之间
D.通常由一家或数家大型百货公司为主要租户
He didn't tell his parents he was going home because he wanted to give them a . [ ]
A. joy
B. surprise
C. shock
D. happiness