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【单选题】
下列哪种方法不是土壤重金属测定的预处理方法( )。A.
全分解法
B.
近似全分解法
C.
有效态金属提取法
D.
有机溶剂提取法
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举一反三
【单选题】The sudden of the headmaster gave the children who were talking loudly in the classroom a great surprise.
A.
entrance
B.
entry
C.
absence
D.
trial
【单选题】To our _____ , the naughty boy finished his homework by himself and there were no mistakes. [ ]
A.
surprised
B.
surprising
C.
surprise
D.
surprises
【简答题】气流干燥器:颗粒在气流中高度分散,传热传质表面很大,传热传质速度很高,干燥时间(),一般仅为()
【简答题】()干燥器:颗粒在气流中高度分散,传热传质表面很大,传热传质速度很高,干燥时间极短,一般仅为几秒
【简答题】根据OSI 各层的主要功能连线
【单选题】To our great________, his parents were________at his mark. [ ]
A.
surprises; surprised
B.
surprises; surprising
C.
surprise; surprised
D.
surprise; surprising
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