下列哪一种工作类型可以直接推动缺陷流程（）A、预试B、小修C、大修D、消缺

下列说法中正确的是         

A．激光是一种人工产生的相干光

B．雷达是利用超声波来测定物体位置的设备

C．相对论认为空间和时间与物质的运动状态有关

D．交通警通过发射超声波测量车速，利用了波的干涉原理

我国在U接口上采用回波抵消方式，选用（）码。

第四节  完形填空（共20小题，每小题1．5分，满分30分）

阅读下面短文，从短文后各题的A、B、C、D四个选项中，选出适合填入对应空白处的最佳选项，并在答题卡上将该选项涂黑。

That night, Joe came back home very late, pulling his heavy legs, obviously tired．He then sat down by the window, ­ 26  his head．

Hearing her husband back, Kay  27  out of the kitchen, but to her  28 , Joe sat still,

without  29 ．Usually, when he came back, he would greet her with a kiss or a hug．Immediately Kay 30 something unusual．She went over to Joe and asked, “Tell me, my dear, any 31  news?”

“Well, I have to say that things are not in our  32 ．It seems that I have no  33 to defeat my opponent (对手)．He’s much more  34 , for he’s been holding the position for nearly four years, and people think he’s done a  35  job．Many signs show that he’s in the 36 ．”

“Oh, really? But I still believe you have our own  37 ．You’re in your forties at the best age for a man．You’re new, so people have reasons to  38  you to do better．So let’s go to the voters and tell hem, ‘Give Joe Hart a chance, and he’ll show you who’s your better 39”

Their next three weeks were spent  40  different neighborhoods, going to all kinds of parties, and making speeches at universities and gatherings．Even Judy and Julie, their small children, went from door to door,  41  their “Please vote for our daddy, Joe Hart!”

The night before the  42 vote, the whole Hart family were too  43 to fall asleep．The moment before the final result was declared, their  44 were brought to their mouths, but at last they all  45 and burst into tears．

Joe Hart became head judge of the state of Texas, USA．

26．A．lifting         B．raising       C．hanging     D．combing

27．A．walked       B．looked       C．kept        D．stole

28．A．anger         B．joy          C．surprise     D．disappointment

29．A．hope         B．movement    C．patience     D．smile

30．A．said          B．sensed        C．told         D．did

31．A．lucky         B．exciting      C．new        D．bad

32．A．favor         B．way          C．place        D．sight

33．A．time          B．thought      C．chance       D．wish

34．A．interesting     B．experienced   C．lovely       D．fit

35．A．good          B．poor         C．beautiful     D．funny

36．A．success        B．office        C．lead         D．government

37．A．people        B．reasons       C．rights        D．advantages

38．A．force         B．expect       C．order         D．ask

39．A．choice        B．friend        C．leader       D．person

40．A．helping        B．visiting       C．inviting            D．traveling

41．A．answering     B．repeating      C．showing     D．offering

42．A．final         B．next         C．first         D．close

43．A．eager         B．sorry         C．anxious      D．happy

44．A．breaths       B．worries       C．tongues      D．hearts

45．A．left          B．arrived             C．laughed      D．jumped

企业的研究与开发是指企业运用自己的技术与开发资源，或者联合其他企业和社会力量，根据企业生产经营活动需要，( )方面进行的知识创新活动。

A．技术

B．经济和管理

C．基础研究

D．产品试制

高碳钢的含碳量应大于下列哪项（）。

A.0.2%

B.0.5%

C.0.6%

D.0.8%