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【单选题】
物流学科研究的对象是 ( )A.
物流要素
B.
物流技术
C.
物流系统
D.
物流设备
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举一反三
【单选题】Unfortunately, when I dropped in, Doctor Wang_____for Chengdu to join in the fight again bird flu, so we only had time for a few words.
A.
just left.
B.
has just left.
C.
is just leaving.
D.
was just leaving.
【单选题】—What about the student in your class, Mr. Wang? —The doctor said that ________ sleep caused him poor memory and poor concentration.
A.
lacking of
B.
lacked in
C.
lacking
D.
lack for
【简答题】试举例说明什么是总体、总体单位、变量、变量值、指标与标志。
【简答题】____________(夫人)Wang is a doctor.
【单选题】. Doctor Wang _____ at seven o’clock for the conference, but she didn’t turn up.
A.
should have arrived
B.
should arrive
C.
should be arrived
D.
should be arriving
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