问题：
[单选题]The radio waves used for radar are very short，only（）long.
A、a few centimeters
B、a few fathoms
C、a few meters
D、a few feet
参考答案：
A
相关内容
- ● which toll i ued for planing for Micro wave Within PaO？（）
- ● In hallow water，wave that are too teep to be table，cauing the cret to move forward fater than the ret of the wave，are called（）.
- ● Some radio wave（）the urface of the earth becaue of it（）.
- ● In the northern hemiphere, the larget wave or well created by a typhoon or hurricane will be located（）.
- ● Radar beacon are tranmitter deigned to produce a（）on the creen of hip’ radar et.
- ● If the radio ignal ground wave extend out for le ditance than the minimum kywave ditance，there i an area in which no ignal i received．Thi i called the（）.
- ● I would be very much（）if you could arrange for a radio technician to come on board a oon a poible for my radar repair.
- ● A feeler or thermal bulb i ued for the expanion valve to （）.
- ● The radio wave ued for radar are very hort，only（）long.
- ● （）i a radio receiver with ablity to ene direction of the incoming radio wave.
- ● Thoe generally ued additive for cooling water are either anti-corroion oil or inorganic（）.
- ● Thee are the principle, however formulated, for which all good men and women throughout the world,（）of race or creed, education, ocial poition, or occupation, are tanding.
