在果实的形成过程中，能够发育成果实的花蕊结构是 [ ]
A．柱头
B．花柱
C．子房
D．花药
C
________ enthusiastic about drawing.
A．It seems to be
B．He seems that
C．It seems that
D．He seems to be
（）指名义厚度减去腐蚀裕量和材料厚度负偏差。
