生产中常采用哪四种方法形成过饱和溶液而使目标产物结晶？
参考答案：
将热饱和溶液冷却、将部分溶剂蒸发、化学反应结晶、盐析结晶。
The required testing for a specific task has been completed and passed. The customer is not confident of the test and requests an additional modified test, this situation indicates inadequate ______ .
A) control proceduresB) audit reviewC) assurance fundingD) quality plan development
劳动就业政策包括（）。
A.失业保险
B.失业救助
C.职业介绍
D.就业辅导
