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【单选题】
滚动轴承不能同时承受轴向径向力的是（）A.
深沟球轴承
B.
圆锥轴承
C.
圆锥滚子
D.
圆柱滚子
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知识点：
皮皮学刷刷变学霸
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【多选题】下列游客购物时,导游人员应提醒游客坚持“五不要”的有( )。
A.
贵重物品不要买
B.
金银物品不要买
C.
宝玉器不要买
D.
大件物品不要买
E.
海关检查的不要买
【简答题】如何理解幼儿学习游戏化？
【单选题】Multiple sperm penetration of a mature egg is prevented by .
A.
molecular barriers secreted by the sperm
B.
cortical reaction of the egg
C.
lowering of intracellular pH
D.
degeneration of the fertilization membrane
【简答题】考虑用循环语句while去改写例5,要求将销售人员表中的姓名,性别和地址一次全部打在屏幕上,显示的结果如下:
【简答题】如何理解“幼儿学习游戏化”和“幼儿游戏课程化”
【简答题】The mainland of Australia is the largest ( ) and the smallest,flattest ( )on earth.
【简答题】9. The sperm whale
( , which , that , , who ) is a mammal, has the largest brain of any animal.
【简答题】A．Sperm, cells, DNA and other genes. B．Sperm, cells, DNA and other products. C．Sperm, organs, DNA and other genes. D．Sperm, organs, DNA and other products.
【单选题】Girl sperm was preferred to boy sperm in the research most probably because ________.
A.
girl sperm contains more genetic material
B.
more mothers want to have girl babies
C.
girl sperm is healthier and more active
D.
girl sperm is more easily purified
相关题目：
【简答题】9. The sperm whale
( , which , that , , who ) is a mammal, has the largest brain of any animal.