现场通信通常使用（）来进行通信A.无线电话 B.无线电传 C.DSC D.以上都可

假如你是Judy，请你根据你的成绩单，给你妈妈写一封信，汇报你的成绩。

Dear Mom,

      How's it going? Things are fine here. I got my report card today. Luckily, I did OK this time.

My English teacher said I was    1      My math teacher said l was    2    and my P.E. teacher said 

I was     3    in class. However, my history teacher said I    4   . Another disappointing result was

in science. My science teacher said l was a    5    student.   

     Well, that's all about the news I have for now. I will have to try harder at science.

                                                                                                                                Love,

                                                                                                                                   Judy

1._____2._____3._____4._____5.______

分为四组，任选一组作答。每题的备选项中，只有1个最符合题意。

( )是利用矿井主要通风机的风压，借助导风设施把新鲜空气引入掘进工作面。

A．引射器通风

B．混合式通风

C．抽出式通风

D．全风压通风

具有抗炎、抗过敏作用的平喘药是（）

A.氨茶碱

B.孟鲁司特

C.倍氯米松

D.色甘酸钠

E.氨溴索

由于镀铬层中含有（）会使铬层发脆。

A、氢

B、硅

C、碳

D、锰

建设单位必须在建设工程立项批准后、工程发包前，向( )办理工程报建登记手续。

A．县级以上人民政府

B．县级以上人民政府授权的部门

C．建设行政主管部门

D．建设行政主管部门授权的部门

E．建筑业协会