证券组合的期望收益率是使可能的预测值与实际值的平均偏差达到最小的点估计值。（）

看图完成对话或句子。

1. —What did you do last weekend, Tom?

    —I went to the               with my friends.

2. —What is the girl doing?

    —Look ! She is _          .

3. Today the weather is            . Let's go outside to play soccer.

4. I climbed the          _   last week.

5. I had a talk with Lucy on the              last week.

The duty-paying value shall be ( ).

A．the value of imports or exports declared by the consignors or consignees

B．the true transaction value of imports & exports

C．the value higher than the transaction value of identical or similar goods

D．the value lower than the transaction value of identical or similar goods

在25℃的房间里，一位同学把插在酒精中的温度计取出后发现[ ]

A. 温度计示数保持原状不动

B. 温度计示数先变大后不变　

C. 温度计示数先变大后变小　　　

D. 温度计示数先变小后变大

下列哪项符合营养性缺铁性贫血

A．RBC数减少＞Hb量减少，TIBC降低

B．RBC数减少=Hb量减少，TIBC升高

C．RBC数减少＜Hb量减少，TIBC升高

D．RBC数减少＝Hb量减少，TIBC降低

E．RBC数减少＜Hb量减少，TIBC降低

函数delete(s,i,n)的作用是从字符串s中删除从第i个字符开始的n个字符，请填空。
void delete(char s[],int i, int n)
int j,k,legth=0;
while(s[length])
【11】 ;
-i;
j=i;

if( 【12】 )
k=i+n;
if(i+n＜length)
while(k＜length)
s[j++]=s[k++];
s[j]=’\0’