依据生产需要计划确定采购计划，按采购计划适时的进料，即能使生产，销售顺畅，又可以节约成本，提高市场竞争力。
参考答案：错
—Tom is so worried about the test that he said he was going to study all night.
—Tell him he should quit ______ and get some help.
A．to have worried
B．to worry
C．worrying
D．from worrying
以下不属于DukesC期结肠癌的是()
A．结肠壁淋巴结转移
B．结肠旁淋巴结转移
C．结肠系膜根部淋巴结转移
D．锁骨上淋巴结转移
E．结肠系膜淋巴结转移
