植物冠幅投影面积与绿化占地面积之比，达到（）以上时为郁闭
A、0、5
B、0．6
C、0、7
D、0、8
参考答案：B
幼儿园课程内容的组织原则有（）与心理顺序，纵向组织与横向组织，直线式组织与（）。
Which of the following statements is least accurate Nonrefundable bonds:（）
A. holder is protected only if interest rates decline.
B. holder is protected from obtaining lower-cost money to pay off the debt.
C. provide greater assurance against premature and unwanted redemption than callable bonds.
