投标全过程的核心工作，对能否中标，能否盈利，盈利多少起决定性作用的环节是（）。
A、制定施工方案
B、标书制作
C、技术方案制定
D、报价
参考答案：D
晚期囊胚约在受精后第几天开始着床（）
A.2
B.3
C.4
D.5
E.6～7
Life insurance, before available only to young, healthy persons , can now be obtained for old people, and even for pets.
A．before young, healthy persons available only,
B．available only to young, healthy persons before,
C．available only to persons young, but more healthy,
D．before young and healthy persons only available to,
