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A．upB．downC．hardD．off
A. up
B. down
C. hard
D. off
A．A scarcity of jobs in their field.B．Inadequate training in methods of biological res
A scarcity of jobs in their field.
B. Inadequate training in methods of biological research.
C. Difficulties in classifying all of the varieties of owls.
D. A lack of funding for their work with endangered species.
灌浆泵容许工作压力应大于最大灌浆压力的()倍。
A. 0.5
B. 1
C. 1.5
D. 2
闭合性气胸肺萎陷在哪一项数值以下时可无明显症状
A. 50%
B. 60%
C. 40%
D. 0.3
E. 0.2
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