光合作用的电子传递体PSⅡ中含有的组分是____。
A.NADP
B.质体蓝素(PC)
C.放氧复合体(OEC)
D.ATPase
参考答案:C
She feels happy because she has ______ good friends here. [ ]
A. no
B. few
C. many
D. any
债券的发行价格与债券的面值必然一致。