兽药经营企业应当设立真实、准确、完整、清晰、工整的()和(),其保存期限不少于3年。
A、用药记录
B、存货记录
C、采购记录
D、销售记录
参考答案:C, D
David failed in the final examination last term and only then________how much time he had wasted
before.[ ]
A. had he realized
B. he had realized
C. did he realize
D. he realized
压力容器在正常工艺操作时容器顶部的压力是( )。
A.设计压力
B.额定压力
C.工作压力
D.最高工作压力