It can be inferred from the passage that______.
A.scientists disagree on the impact of low-linear energy transfer
B.scientists are not concerned about environmental aspects of cancer causes
C.the amount of low-level radiation has increased greatly since 1958
D.the causes of some cancers can be ascertained by finding out the source of radiation
第6题
井下常见的过流故障有()。
A.漏电
B.三相短路
C.两相短路
D.过载
E.断相
F.电压过高G电压过低
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