参与工程竣工验收的各方不能形成一致意见时，应( )，待意见统一后，重新组织工程竣工

下面说法不正确的是（　　）

A．7是49的平方根

B．25的平方根是5

C．-216的立方根是-6

D．49的算术平方根是7

骨肿瘤的诊断原则是________、________和________相结合。

所谓稀疏矩阵指的是________。

A．非零元素个数较多的矩阵

B．零元素个数占矩阵元素总个数一半的矩阵

C．零元素个数远远多于非零元素个数且分布没有规律的矩阵

D．包含有零元素的矩阵

What does the speaker mean a. You don’t have to pay any attention to him for he has already had many people around him. b. You don’t have to pay any attention to him for he will not take it seriously. c. You don’t have to pay any attention to him for he has already got drunk. d. You don’t have to pay any attention to him for he is busying dealing with many things.