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单选题
Calcium carbide and acetone are counteractive（）nature.
A
by
B
in
C
from
D
with
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单选题The purpose of the ashing step in graphite-furnace atomic-absorption spec-troscopy is to（）A
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判断题检索钙（calcium）用于食品（food）或者饲料（feed）的添加剂（additive）的英文信息，检索式是：calcium and food or feed and additiveA
对B
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填空题英译中（Translate）：calcium pump（）
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