洁净区
A．干热空气灭菌B．流通蒸气灭菌C．热压灭菌D．紫外线灭菌E．滤过除菌
参考答案：C
根据黑度的定义，其数学表达式是（）。
. —Where is my dictionary? I remember I put it here yesterday.
—You __________ it in the wrong place.
A．must put
B．should have put
C．might put
D．might have put
