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A．upB．downC．hardD．off

A. up
B. down
C. hard
D. off

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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.

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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

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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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煨制品含药屑、杂质不得过

A. 0.01
B. 0.02
C. 0.03
D. 0.04
E. 0.05

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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

灌浆泵容许工作压力应大于最大灌浆压力的()倍。

闭合性气胸肺萎陷在哪一项数值以下时可无明显症状

煨制品含药屑、杂质不得过

A. up
B. down
C. hard
D. off