[单选题]中华人民共和国成立后制定的第一步正式法律是 ()
A. 《工会法》;
B. 《土地改革法》;
C. 《婚姻法》;
D. 《刑法》

What is lean production Perhaps the best way to describe this innovative production system is to contrast it with craft production and mass production, the two other methods humans have devised to make things.
The craft producer uses highly skilled workers and simple but flexible tools to make exactly what the consumer asks for — one item at a time. Custom furniture, works of decorative art, and a few exotic cars provide current-day examples. We all love the idea of craft method — as automobiles once were exclusively — cost too much for most of us to afford. So mass production was developed at the beginning of the twentieth century as an alternative.
The mass-producer uses narrowly skilled professionals to design products made by unskilled or semiskilled workers tending expensive, single purpose machines. These churn out standardized products in very high volume. Because the machinery costs so much and it is so intolerant of disruption, the mass-
A. Colored pencils.
B. Exotic sports car.
C. Notebooks.
D. Wooden basins.