单项选择题

颈内静脉穿刺置管时,通常选择右侧颈内静脉而非左侧,其原因与下列哪项无关( ) A.
右颈内静脉与无名静脉和上腔静脉几乎成一直线 B.
右侧胸膜顶低于左侧, C.
右侧无胸导管 D.
右侧颈内静脉容易暴露

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Refer to Figure 2.3. Assume that in this society the marginal rate of transformation of sailboats for surfboards is constant and equal to -10. A graph of this society's production possibility frontier will be represented by

A．A
B．B
C．C
D．D