烘焙产品经过适当的包装，能达到下列何种效果（）
A.增加储存时间
B.防止风味改变
C.防止污染
D.以上皆是
参考答案：D
You have just taken control of a project in the middle of execution and need to learn who has approval authority for revisions in scope（）document provides this information.
A.Resource assignment matrix
B.Change control plan
C.Project charter
D.Client organization chart
普通混凝土试件的标准养护条件：温度为（）℃。
A.20±1
B.20±2
C.22±1
D.22±2
