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
