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单项选择题

A factory produces some parts. In general, a box of parts in the manufacturing cycle requires 0.02 Days of processing time and 0.08 days of material processing, waiting time and Kanban recovery time. There are 22 parts per box, and the daily requirement of parts is 2000. Considering the uncertainty of demand, the safety inventory is 10% of the demand. If the kanban is shipped once a day and brought back to the last kanban without delay, calculate the number of kanbans required. the number is ( ).

A．10
B．20
C．30
D．40

问答题

下列哪组不是投影面垂直线投影图?____。