电机都有什么型号:I'm glad he's become such a _____ character

选D
solid是结实的的意思
fix根本就不靠谱
firm是坚定的意思，是形容人的信念的
stable是稳重的，可以用来形容性格
这句话的意思是，我很高兴他现在变的如此稳重

solid
英英解释为：
形容词solid:

1. of definite shape and volume; firm; neither liquid nor gaseous

2. characterized by good substantial quality

3. entirely of one substance with no holes inside

4. of one substance or character throughout

5. uninterrupted in space; having no gaps or breaks

6. providing abundant nourishment
同义词：hearty, satisfying, square, substantial

7. of good quality and condition; solidly built
同义词：strong, substantial

8. not soft or yielding to pressure
同义词：firm

9. having three dimensions

10. incapable of being seen through

11. financially sound

12. of a substantial character and not frivolous or superficial

13. of the same color throughout
同义词：self-colored, self-coloured

14. morally admirable
同义词：worthy, upstanding

15. acting together as a single undiversified whole
同义词：unanimous, whole

详看第四条