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【单选题】
终点误差的产生是由于A.
滴定终点和化学计量点不符
B.
滴定反应不完全
C.
试样不够纯净
D.
滴定管读数不准确
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【简答题】当PLC置于RUN状态时，M8000（），M8002（）。
【简答题】简述国际贸易单证员必须达到的要求。
【单选题】某患者男性，42岁，2周来自述餐后上腹胀痛不适，每晚或次日清晨经常呕吐，呕吐量大，吐后腹胀缓解。食欲尚可。腹部检查发现胃型及胃蠕动波。该患者最可能发生了
A.
急性胃扩张
B.
急性胃炎
C.
急性胆囊炎
D.
肠梗阻
E.
幽门梗阻
【单选题】If dogs could talk,perhaps we would find it just as hard to get along with them as we do with people. The sentence tells us that
A.
it's painful for us to get along with dogs
B.
it's fortunate that dogs could not talk
C.
it's difficult to get along with dogs
D.
it's not easy for us to get along with people as well as dogs
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