工程项目成本管理方法中，( )是揭示项目成本变化情况及其变化原因的过程。 A．成本

假设主频为66MHz的Pentium微处理器以非流水线方式访问存取时间为60ns的DRAM存储器，则在T1周期与T2周期之间至少应插入几个等待状态

A) 1个
B) 2个
C) 4个
D) 6个

根据短文内容及首字母提示，填写所缺单词，使短文意思完整，每空限填一词。

The worst traveler in the world was Paul of San Francisco. Once he f 小题1: from the U.S. to his hometown in Italy to see someone at home. The plane made a one-hour stop to get oil at an airport in New York. Paul thought he was in Rome,  s小题2: he got off the plane.

　　When nobody was there to meet him, Paul thought maybe the heavy  t 小题3:  made his friends late. While looking for their address, Paul found that the old “Rome” had changed a lot. He found many high m   小题4:  buildings instead of old ones. He also found that many people spoke English but not Italian and that main street signs were w   小题5:  in  English.

　　Paul knew very l   小题6: English. So he asked a policeman in Italian the way to the bus station. He happened to meet a policeman who was also born in Italy and answered in the same l   小题7:   .

　　After twelve hours’ traveling round on a bus, the driver handed him over to  a 小题8: policeman But this time, this policeman could only speak English. So Paul asked the policeman why the Rome police employed(雇佣)so many people who spoke English as policemen.

　　Paul didn’t b   小题9: he was in New York when he was told so. To get him on a plane to Italy, he was s小题10:    to the airport in a police car.　

已知某种限制性内切酶在一线性DNA分子上有3个酶切位点，如图中箭头所指。如果该线性DNA分子在3个酶切位点上都被该酶切断，则会产生a、b、c、d四种不同长度的DNA片段。现有多个上述线性DNA分子，若在每个DNA分子上至少有1个酶切位点被该酶切断，则从理论上讲，经该酶切割后，这些线性DNA分子最多能产生长度不同的DNA片段种类数是

A．3

B．4

C．9

D．12

元朝时“胡人有妇解汉音，汉女亦解调胡琴”的诗句反映了[ ]

A．回族与汉族人民的融洽关系

B．蒙汉人民的融洽关系

C．女真族与汉族的关系

D．蒙汉两族的矛盾

一般情况下，固定画面在拍摄时必须牢记“（）”字当头，避免不必要的（）。