由于卷烟产品的供需特性,卷烟供应链需要满足()两方面的要求。
A.风险规避和响应快速。
B.高效和风险规避。
C.高效和敏捷。
D.风险窥秘和敏捷。
参考答案:C
The split between humans and apes is believed by scientists______15 to 20 million years ago.
A.to be occurring
B.having occurred
C.to have occurred
D.to occur
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A.分配系数
B.容量因子
C.保留时间
D.峰宽
E.半高峰宽