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【单选题】
已知一幅机械加工图纸的绘图比例是2:1，图中尺寸标注的高度为56，则该产品的实际高度为（）A.
42mm
B.
168mm
C.
56mm
D.
84mm
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A.
对称类比
B.
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综合类比
D.
拟人类比
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A.
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B.
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直接类比
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对称类比
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couldn't drive well.
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was not rich enough to buy gas.
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