医用核素活度计探测射线的依据是()。
A.电离作用
B.荧光现象
C.感光效应
D.康普顿散射
E.光电效应
参考答案:A
正常脑脊液中氯化物含量为()
A.90~100mmol/L
B.110~120mmol/L
C.120~130mmol/L
D.130~140mmol/L
E.100~110mmol/L
Cyclones that have warm sectors usually move().
A.westerly
B.parallel to the isobars in the warm sector
C.toward the nearest high pressure area
D.faster than the accompanying cold front