农业推广学的目的是什么？
参考答案：
1）发展农村生产力
2）培养农民的个人能力与素质。
"They didn’t take measures in time, otherwise the explosions ____．"some experts said．
A．wouldn’t happen
B．didn’t happen
C．wouldn’t have happened
D．mustn’t have happened
怎样操作翻车机？
