According to the passage, the widely held view of Archean- age gold-quartz vein systems is
A. were formed from metamorphic fluids
B. originated in molten granitelike bodies
C. were formed from alluvial deposits
D. generally have surface expression
E. are not discoverable through chemical tests
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The author’s attitude toward the view that living things are divided into three categories
A. tentative acceptance
B. mild skepticism
C. limited denial
D. studious oriticism
E. whole hearted endorsement
该化合物的慢性无作用剂量为
A. 160mg/kg
B. 40mg/kg
C. 10mg/kg
D. 2.5mg/kg
E. 无法确定
我国会计年度是()。
A. 农历1月1日起至12月31日
B. 公历1月1日起至12月31日
C. 农历7月1日起至次年6月30日
D. 公历3月1日起至2月28日
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