当距波源距离足够大时，波束轴线上声压与（）成正比。
参考答案：波源面积
销售大厅岗对拾遗的物品，做好记录，及时联系失主或上交至管辖区域派出所处理。
It was because of bad weather ____ the football match had to be put off.
A．so
B．so that
C．why
D．that
