大肠埃希菌所致下述哪种疾病()
A.肠热症
B.败血症
C.猩红热
D.泌尿系感染
E.急性肠炎(食物中毒)
参考答案:D
某商品流通企业经销某种家用电器,销售单价为3200元/台,单位商品的变动成本为2800元/台,固定成本分摊为l2万元。该种家用电器的保本销售量为( )台。
A.300
B.350
C.400
D.450
In plugging submerged holes on a vessel,rags,wedges,and other materials should be used in conjunction with plugs to().
A.reduce the water pressure on the hull
B.reduce the water leaking around the plugs
C.prevent progressive flooding
D.reduce the possibility of stress fractures