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【单选题】
在常规制片HE染色中，细胞核的染色原理是A.
细胞核带正电荷，呈碱性，易与带负电荷的苏木素碱性染料结合而染色
B.
细胞核带负电荷，呈碱性，易与带正电荷的苏木素碱性染料结合而染色
C.
细胞核带负电荷，里酸性，易与带正电荷的苏木素酸性染料结合而染色
D.
细胞核带正电荷，呈酸性，易与带负电荷的苏木素碱性染料结合而染色
E.
细胞核带负电荷，呈酸性，易与带正电荷的苏木素碱性染料结合而染色
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A.
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B.
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A.
选择性扩张冠状动脉,增加心肌供血
B.
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C.
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D.
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E.
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A.
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B.
阻断β受体，降低心肌耗氧量
C.
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D.
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B.
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C.
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