当拟采购项目的详细资料缺乏时，（）是一种估计项目总费用的行之_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

当拟采购项目的详细资料缺乏时，（）是一种估计项目总费用的行之有效的方法。

A．自上而下估计法

B．自下而上估计法

C．类比估计法

D．费用计划曲线法

答案

参考答案：C

完形填空

完形填空。
     American people like to    1 "Thank you" when others help them or say    2   to them. Many Chinese
people do so,    3   . It is a very    4   . You must say "Thank you" when someone passes you something on
the table, when someone    5 the door open for you, when someone says you do your work    6   , or you buy a nice thing or your city is    7   .
     "Excuse me" is another sentence (句子) they often say. When you hear someone say "Excuse me"    8
you, you know he wants to pass you without touching (接触) you. If you want    9   others, say "Excuse
me" first, and then begin talking.
    Let's   10   "Thank you: and "Excuse me" from now.

( )1. A. speak
( )2. A. something good
( )3. A. also
( )4. A. healthy habit
( )5. A. keeping
( )6. A. hardly
( )7. A. beautiful
( )8. A. next from
( )9. A. break
( )10. A.say

B. say
B. anything good
B. so
B. good habit
B. keep
B. good
B. dirty
B. across to
B. to break
B. to say

C. tell
C. good something
C. either
C. good lifestyle
C. keeps
C. well
C. crowded
C. in front
C. breaking
C. saying

D. talk
D. good anything
D. too
D. healthy lifestyle
D. kept
D. nice
D. boring
D. behind
D. breaks
D. said

填空题

直角坐标系内，一点光源位于A（0，4）处，线段CD⊥x轴，D为垂足，C（3，1），则CD在x轴上的影子长为（），点C的影子坐标（）。