问题
单项选择题 A1/A2型题
关于当量剂量的描述错误的是()
A.SI单位是Sv
B.曾用单位是rem
C.是不同射线类型对组织和器官形成辐射危害的度量
D.辐射权重因子无量纲
E.能够反映不同组织或器官对辐射的敏感程度
答案
参考答案:E
关于当量剂量的描述错误的是()
A.SI单位是Sv
B.曾用单位是rem
C.是不同射线类型对组织和器官形成辐射危害的度量
D.辐射权重因子无量纲
E.能够反映不同组织或器官对辐射的敏感程度
参考答案:E
The Special Satellites Man has invented four kinds of satellites. The first kind of satellite studies the__1__of the earth. They are used to make maps. They also help countries to see where they may__2___ oil or gold. The second kind of satellite is used to guide ships and planes. A ship or a plane can _3__a message to the satellite, and the satellite can find out __4___ the ship or the plane is. The third kind studies the weather. These satellites_5__ the cloud and strong winds moving across the earth. They warn countries to make preparations when _6__ weather is coming. ___7__kind is used for communication. Telephone calls__8_countries can be sent by these satellites. Some can carry hundreds of calls at the same time. The call is sent to the satellites, then the __9__sends it to the station in the country and the country is being phoned. These satellites also carry pictures, they can receive and send __10__at a time, which we can watch on TV.
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