单项选择题
下图是冷冻浓缩的双组分相图，图中E点指的是（ ）。
A、凝固点
B、共晶点
C、结晶点
D、浓缩点
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单项选择题
Which chemical composition is generally considered to be invalid or impurity
A．alkaloids
B．flavonoids
C．saponin
D．chlorophyll -
问答题
对于逻辑控制环节的设计，DLC的输入信号应选择____（2分）
