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【单选题】
放射性测同位素厚仪测量金属薄膜选用β粒子能量较高的90Sr源，其活度范围()。
A.
10mCi-100mCi
B.
10mCi-500mCi
C.
100mCi-500mCi
D.
500mCi-5Ci
参考答案：
参考解析：
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【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals