一个富裕的商人,常年从事丝绸生意,为了多赚钱,他雇用了几十个工人为他生产布匹, 这一现象最早出现在[ ]
A.唐朝
B.元朝
C.明朝
D.清朝
答案:C
Independent innovation has brought us a________in profits,40% higher than in the traditional way.
A.boom
B.failure
C.decrease
D.suffering
H01-6是射吸式气焊焊炬型号。