下表中“农业生产三年三大步”得益于
A.大跃进
B.人民公社化
C. * *
D.家庭联产承包责任制
答案:D
The mayor says that the new hospital ____________by the end of 2011.
A.has been completed
B.has completed
C.will have been completed
D.will have completed
请问与四冲程柴油机比较,在相同工作条件下二冲程柴油机()。
A.回转均匀,换气质量好
B.换气质量差,做功能力差
C.热负荷较大,转速较低
D.输出功率大,回转不均匀