共工程双代号网络计划如下图所示,其关键线路有()条。
A.1
B.2
C.3
D.4
参考答案:C
Jane was disappointed that most of the guests
when she at the party.
A.left; had arrived
B.left; arrived
C.had left; had arrived
D.had left; arrived
以马克思主义为基础最早探讨教育学问题的著作是( )
A.加里宁的《论 * * 主义教育》B.马卡连科的《教育诗》C.克鲁普斯卡娅的《国民教育与民主制度》D.杨贤江的《新教育大纲》