起重作业中“五个明确”的内容是什么？
参考答案：
1、吊物重量；2、吊物长度；3、吊物安装位置；4、吊车作业半径；5、吊车额载
(2013·高考北京卷)Experts believe________people can waste less food by shopping only when it is necessary.
A．why
B．where
C．that
D．what
有以下程序 fun(char P[][10]) {int n=0,i； for(i=0；i<7；i++)if(P[i][0]==‘T’)n++； return n；} main(){char str[10]={"Mon","Tue","Wed","Thu","Fri","Sat","Sun"}；printf("％d＼n",fun(str))；}程序执行后的输出结果是
A．1
B．2
C．3
D．0
