辐射探测器有几种型号，有的是手持设备，有的腕式手表一样，有的像寻呼机一样挂在皮带上。
Radiation detectors come as hand-held devices, wrist watches and pager-size gadgets that hang from the belt.
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至今已经有好几种型号的FCL被推荐使用。
Several types of FCL have been proposed so far.
应用推荐
模块上移
模块下移
不移动