更多"[判断题]无线通信有多种分类方式,按频段分主要有中波(MW),短波(S"的相关试题:
[判断题]无线通信有多种分类方式，按频段分主要有中波(MW)，短波(SW)，超短波(VHF，UHF)和微波等。( ) （易）(基础知识)
A.正确
B.错误
[单选题] 如果两个频率之间小于( )赫兹VHF1和VHF2之间或VHF3和VHF2之间,就会产生干扰
A. 2赫兹
B. 3赫兹
C. 4赫兹
D. 5赫兹
[单选题]. 如果两个频率之间小于( )赫兹VHF1和VHF2之间或VHF3和VHF2之间,就会产生干扰
A. 2赫兹
B. 3赫兹
C. 4赫兹
D. 5赫兹
[单选题] International distress signal in VHF calling for help is ______．
A.Help，Help，Help
B.Mayday，Mayday，Mayday
C.Save，Save，Save
D.Rescue，Rescue，Rescue
[单选题]不是超短波疗法的绝对禁忌证的是
A.妇女月经期下腹部
B.使用足够剂量抗癌药物的癌症病人
C.戴有人工心脏起搏器者
D.机体极度衰弱者
E.高热病人
[单选题]培训方式有多种分类方法，如按照培训地点，可分为( )和现场培训。
A.课堂培训
B.岗位培训
C.实物培训
D.理论培训
[单选题] When making VHF radio calls to nearby stations, what level of transmitting power should you use?
A. Low power
B. Medium power
C. High power
D. Extra high power
[单选题] What does the abbreviation VHF stand for？
A. Vessel's Hoisting Flag
B. Very High Safety
C.Vessel's Homing Frequency
D. Very High Frequency
[单选题]培训方法有多种分类方法，如按照培训的地点，可分为课堂培训和( )。
A.实物培训
B.岗位培训
C.现场培训
D.理论培训
[单选题]计算机网络可以有多种分类,按拓扑结构分,可以分为____结构等。
A.局域网、城域网、广域网
B.物理网、逻辑网
C.总线网、环形网、星形网
D.ATM网
[判断题]冷水机组有活塞式、螺杆式、涡旋式、离心式、吸收式等多种分类。
A.正确
B.错误
[单选题] VHF Radio is one of the very important navigational instruments on board，______ messages can be sent．
A.by which
B.through which
C.by that
D.through that
[单选题] All VHF marine band radios operate in the simplex mode, which means that ______.
A. only one person may talk at a time
B. only two persons may talk at the same time
C. the radio only transmits
D. the radio only receives
[单选题] When the changing of a VHF channel / frequency is accepted，say _______.
A. I am going to change to VHF channel ...
B.I am certainly going to change to VHF channel ...
C.Changing to VHF channel ...
D.VHF channel ... has been changed
[单选题]下列不是超短波疗法的禁忌证的是 P28
A.月经期下腹部
B.带有心脏起搏器
C.急性肾衰竭
D.高热患者
E.机体极度衰弱者
[单选题]在应急电气构型下哪部VHF可用？
A. VHF1
B. VHF2
C. VHF1和VHF2
D. 三部都可用
