细菌、真菌培养的一般步骤是( )①高温灭菌 ②接种 ③配制含有营养物质的培养基 ④恒温培养
A:①②④③
B:②①④③
C:①③②④
D:③①②④
—You are right.
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Our class _______ forty-five students, in other words, forty-five students ______ our class.