【判断题】维持物流企业老客户的成本大大低于吸引新客户的成本。
【单选题】Not once__________his view of life.
A.
did the gentleman mention
B.
the gentleman mention that
C.
the gentleman mentioned
D.
the gendeman does mention
【单选题】企业网银回单的数据文件,各分行须保留()个月。
【单选题】Can you tell me __________
D.
whom is that gentleman
【简答题】用水提取中药化学成分的操作方法有______、______和______;影响提取效率最主要的因素是______。