对物资验收的标准是什么?
参考答案:验收标准是国家标准、行业标准、企业标准。
Apart from the urgent problems _____________by wars and conflicts, the UN helps countries with other problems such as lack of education ,lack of food , poverty ,disasters and disease.
A.to cause
B.having been caused
C.caused
D.having caused
构件的长细比是计算长度与相应截面积之比。