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问题
单项选择题
判断呼吸性酸碱失衡的唯一指标是()
A.PH
B.PaO
2
C.SaO
2
D.PaCO
2
E.BE
答案
参考答案:
D
选择题
There _____ many kinds of birds around here, but now we seldom see them because of the air pollution.
A. had
B. used to have
C. used to be
D. are
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判断题
机构中形成相对运动的各个运动单元称为零件。
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