衡量一项技术的适用性的标准是（）；产品适用性；工艺适用性。

句型转换。

1.The man is a famous dancer.(就画线部分提问)

    ________ ________the man?

2. He went to school when he was eight years old.  (改为同义句)

    He________ ________to school________he was eight years old.

3. born, he, in, 1981, was, or, 1984 (?) (连词成句)

    __________________________________________________