This pair of shoes __________ hand, and it __________ very comfortable.
A:is made with; is felt
B:are made from; is felt
C:are made of; feels
D:is made by; feels
等差数列{an}中,a4+a8=10,a10=6,则公差d等于( )
《唐六典》记:“工巧业作之子弟,一入工匠后,不得别入诸色”;《新唐书》载:“细镂之工,教以四年;车路、乐器之工,三年;平漫刀矟(长矛)之工,二年……教作者传家技。”这表明唐代工匠( )
①频繁更换工种 ②长期在官府作坊干活
③职业是世袭的 ④是临时工人