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【单选题】
已知截平面与圆锥轴线垂直, 其截交线的形状是( )。A.
圆
B.
矩形
C.
椭圆
D.
抛物线
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反馈参考答案：
举一反三
【单选题】( )又名西陉关,为世界文化遗产,位于山西省忻州市代县县城以北约20公里,是中国长城文化、关隘文化的瑰宝。名将李广、卫青、霍去病、薛仁贵等都曾经在此驻扎,自古便是兵家必争之地!
A.
娘子关
B.
平型关
C.
雁门关
D.
杀虎关
【多选题】Which are truth about the cellular senescence?
A.
senescence occurs at molecules level
B.
senescence occurs at cells level
C.
senescence occurs at tissues level
D.
senescence occurs at organ systems level
【简答题】挡板的作用以及全挡板条件
【单选题】Which of the following is consistent with a model for aging in which stresses leading to DNA damage cause senescence?
A.
Werner's syndrome is a premature aging illness, possibly caused by a defect in DNA repair.
B.
Dietary restriction in mammals reduces the production of DNA damaging free radicals in the mitochondria.
C.
Senescent cells in culture that have stopped dividing often express p21 and p16, proteins that are normally activated in response to DNA damage.
D.
All of these facts are consistent with a model for aging based on DNA damage.
【简答题】挡板的作用是什么?全挡板的条件是什么?
【判断题】The senescence cells persist and survive for a shorter time than apoptosis.
A.
正确
B.
错误
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