简述胆囊底的体表投影。
参考答案：
胆囊底的体表投影在右锁骨中线与右肋弓相交处。
Economists attribute the world soybean boom to the rise in soybean production in China and its increased export of related products.
水流经过一渐缩圆管，若已知直径比d1/d2=2，则雷诺数之比Re1/Re2=( )。
A．1:2 B．1:1 C．2:3 D．2:1
