在正整数中，前50个偶数和减去50个奇数和的差是[ ] A 50 B -50 C

无缝线路强度检算，以最低轨温下列车高速运行，钢轨应力不超出容许值。

根据短文内容和所给首字母提示，写出合适的单词（每空0.5分，共5分）

Mr. Green, a man of fifty-two, was a gardener(花匠). He’s good at g  1  flowers and he’s one of the b  2   gardeners in the town. Last year he c  3   to work for Mrs. Stone, a rich fat old woman.

Mrs. Stone knew n  4   about gardens, but she thought she knew a lot, and she always told the old gardener to do w  5  she said. Sometimes he listened t  6  her, but sometimes he didn’t.

Once Mr. Green got very a  7   with Mrs. Stone and called her a sow(母猪). Mrs. Stone d  8 like it and went to tell it to her friend, a judge(法官). The judge made Mr. Green s  9  sorry to Mrs. Stone.

“Does that mean I can’t call the lady a sow(母猪) any more?” Mr. Green asked . “Yes,” answered the judge. “And can I call a sow(母猪) a lady, sir?” asked Mr. Green. “Yes, you can if you like.” Mr. Green l  10  at the fat woman and said, “Goodbye, lady.”

窝洞制备中不属于抗力形设计的是（）

A.盒状洞形

B.有一定深度

C.邻面洞制备阶梯

D.邻面洞制备梯形

E.窝洞外形呈圆缓曲线

应用动态控制原理进行建设工程项目投资控制时，相对于工程合同价而言，投资的计划值有（）。

A．投资规划

B．工程概算

C．工程预算

D．工程决算

E．工程进度款

教育研究人员利用应用研究的結果，透过实际教育行动解決实际教育问题是属于哪一类型的研究（）

A.基础研究

B.量的研究

C.行动研究

D.质的研究