单项选择题

A．building
B．structure
C．mixing
D．manufacture
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单项选择题
A．weaponB．mixtureC．explosiveD．discovery
A．weapon
B．mixture
C．explosive
D．discovery
单项选择题
A．mixing withB．mixed withC．was mixing withD．was mixed with
A．mixing with
B．mixed with
C．was mixing with
D．was mixed with
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