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【单选题】
房室延搁的生理意义是A.
使P波增宽
B.
使QRS波增宽
C.
使心室肌有效不应期延长
D.
使心室肌不会产生强直收缩
E.
使心房、心室不会产生收缩重叠
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【简答题】拟测设距离D=49.550m，两点间坡度均匀，高差为1.686m，丈量时的温度为27℃，所用的钢尺的尺长方程式为ιt=30m+0.004m+O.0000125(t-20)x30m，则测设时在地面上应量的斜距是()。 (A)49.546m (B)49.571m (C)49.531m (D)49.568m
【单选题】拟测设距离D=49.550m，两点间坡度均匀，高差为1.686m，丈量时的温度为27℃，所用的钢尺的尺长方程式为11=30m+0.004m+0.0000125(t－20)×30m，则测设时在地面上应量多少?
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A.
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D.
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