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维生素C见光易变色所以要避光保存。()

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A student claimed that polycarbonate is more dense than PA-6. Do the results of Experiments 1-3 support his claim？

A. No, because in Liquid 8, polycarbonate stayed at the bottom and PA-6 rose.
B. Yes, because in Liquid 8, polycarbonate stayed at the bottom and PA-6 rose.
C. No, because in Liquid 8, polycarbonate rose and PA-6 stayed at the bottom.
D. Yes, because in Liquid 8, polycarbonate rose and PA-6 stayed at the bottom.

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维生素C见光易变色所以要避光保存。()

A student claimed that polycarbonate is more dense than PA-6. Do the results of Experiments 1-3 support his claim？

临床上使用洋地黄制剂时，对伴肝功能障碍的心功能不全患者宜选用地高辛，对伴肾功能严重不良的心功能不全患者宜选用洋地黄毒苷。()

维生素K1，K3均可制成可溶性注射液，大量使用本类药物可以起高铁血红蛋白血症而致溶血性贫血。()

分析测量值的精密度高，则其准确度一定高。()