例句 /

The silicon carbide fiber and polycarbosilane fiber developed in 1990 have come up to advanced world standard. They promise wide application in astronautic field sand national economy.

The silicon carbide fiber and polycarbosilane fiber developed in 1990 have come up to advanced world standard. They promise wide application in astronautic field sand national economy.

1990年研制成功并达到国际先进水平的连续碳化硅纤维和聚碳硅烷纤维,在宇航和国民经济中有着广泛的应用前景。