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【单选题】
阴茎套的避孕原理是（）A.
抑制排卵
B.
改变宫颈黏液性状，阻碍受精
C.
阻止精子进入宫腔
D.
改变子宫内膜形态和功能，阻碍着床
E.
使精子卵子不能相遇
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反馈参考答案：
举一反三
【简答题】你的家庭中有讨论过有关毒品预防的话题吗??
【简答题】This year, who “entertained us, challenged us and changed our world”? Absolutely(毫无疑问地), Jeremy Lin, an Asian-American NBA rising star, is one of those people. On April 18, TIME Magazine named him one...
【单选题】The extent to which consumers desire to use new technology is commonly influenced by factors such as consumer attitudes toward specific technologies (Bobbit and Dabholkar, 2001; Curran et al., 2003), ...
A.
An idea can be based on a general perception created by another influential text.
B.
An idea can synthesize a number of other ideas.
C.
One idea can apply another idea to a new situation.
D.
An idea can be formulated as a rebuttal to another idea.
【单选题】The Businessman of the Century Led by people who could take an idea and turn it into an industry, our world reached unheard-of levels of productivity and prosperity. From Henry Ford at one end of the ...
A.
Y
B.
N
C.
NG
【多选题】农药残留,兽药残留,化学物质在体内长时间累积会扰乱生理代谢、促进疾病发生,严重的还可能导致三致作用。”三致“指的是( )。
A.
致癌
B.
致死
C.
致畸
D.
致突变
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