人参、大黄、栀子的显微特征中可见到的草酸钙结晶是()。
参考答案:草酸钙簇晶
Some researchers believe that many patterns of nature are rules of their own and not affected by natural selection.
A.making
B.breaking
C.following
D.bending
产前检查时,骨盆外测量中最重要的径线是()。
A.骶耻外径
B.髂棘间径
C.髂嵴间径
D.坐骨棘间径
E.坐骨结节间径