【单选题】The boy, _____ parents went to the US last year, felt lonely.
【单选题】You should have felt ______yourself for not helping the boy who was struggling desperately for life in the water. [ ]
【判断题】由于水利工程体积庞大,对环境的影响较大,所以其建设必须符合流域规划和环境规划要求。
【单选题】With all the family members ______ on vacation without him, the boy felt extremely lonely and afraid.
【单选题】the boy felt that
A.
he was appreciated by his family
B.
life was dull and there was no change whatever
C.
he was regretting being a member of the family
D.
his father often ignored him
【单选题】The boy felt that _________.
A.
he was appreciated by his family
B.
life was dull and there was no change whatever
C.
he was regretting being a member of the family
D.
his father often ignored him
【判断题】病毒基因可能是单链或双链,闭合环状或线性, DNA 或 RNA 组成。
【简答题】零序电流保护的整定值为什么不需要避开负荷电流?