急性毒性试验观察周期一般为( ) A.1天 B.1周 C.2周 D.3周 发布时间:2019-04-13 13:54 │ 来源:www.tikuol.com 题型:单项选择题 问题: 急性毒性试验观察周期一般为( )A.1天 B.1周 C.2周 D.3周
题型:单项选择题 根据句意及首字母(汉语)提示,补全单词。1. They have a____ their aim.2. Hard work is the key to s____.3. "Go for" is a____(短语)verb.4. Please c____to work, never give up.5. Because of his (疾病),he dropped out of the football team. 查看答案