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【单选题】New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. R...
A.
before
B.
after
C.
although
D.
near
【单选题】X射线衍射仪由X射线发生器、测角仪、辐射探测器、记录单元或自动控制单元等部分组成,其中( )是仪器的中心部分。
A.
辐射探测器
B.
测角仪
C.
Ｘ射线发生器
D.
自动控制单元