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【多选题】
According to Adelaide Centre for Bioethics and Culture in Australia, which of the following statements about bioethics are correct?A.
Bioethics is concerned with questions about basic human values such as the rights to life and health, and the rightness or wrongness of certain developments in healthcare institutions, life technology, medicine, the health professions and about society's responsibility for the life and health of its members.
B.
Bioethics involves issues relating to the beginning and end of human life, all the way from issues relating to in-vitro fertilisation and abortion to euthanasia and palliative care. Bioethics has an impact on every level of human community from the local nursing home to the huge international conferences on issues like the Human Genome.
C.
Bioethics is a branch of "applied ethics" and requires the expertise of people working in a wide range disciplines including: law, philosophy, theology, medicine, the life sciences, nursing and social science. Bioethics is full of difficult ethical questions for everybody: families, hospitals, governments and civilization.
D.
Fundamental values are at stake: human life, the dignity of the frail and elderly, just healthcare, bodily integrity and the ability to make reasonable decisions.
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【单选题】细线 OA 、 OB 的 O 端与质量为 m 的小球拴接在一起, A 、 B 两端固定于竖直墙面上,其中细线 OA 与竖直方向成 45° 角,细线 OB 与竖直方向成 60° 角,如图所示,现在对小球施加一个与水平方向成 45° 角的拉力 F ,小球保持静止,细线 OA 、 OB 均处于伸直状态,已知重力加速度为 g ,小球可视为质点,下列说法错误的是
A.
在保证细线 OA 、 OB 都伸直的情况下，若 F 增大，则细线 OA 中拉力变小，细线 OB 中拉力变大
B.
当 F ＝ mg 时，细线 OB 中拉力为零
C.
为保证两根细线均伸直，拉力 F 不能超过 mg
D.
为保证两根细线均伸直，拉力 F 不能超过 mg
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