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尽管绝大多数新生儿会遵循正常的发育模式,但是有些新生儿会遇到来自环境的不利因素,会使其发展走上不正常的轨道。通常人们将影响胎儿生理和心理发展异常的因素称为致畸因子,以下属于致畸因子的是( )A.
遗传因素
B.
环境因素
C.
物理因素
D.
母体因素
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【简答题】阅读理解。 Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it la nded upside down in three feet of water. Mr. Johnson took the only escape route...
【简答题】Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. He took the only escape route—through the boo...
【简答题】阅读理解。 Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route ...
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【简答题】平均键能可以估算反应热。 H2(g) + F2(g) ------ 2HF(g) 查出平均键能,估算该化学反应的反应热。
【简答题】阅读理解。 Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route-...
【简答题】平均键能可以估算反应热。 H2(g) + C2H4(g) ------ C2H6(g) 查出平均键能,估算该化学反应的反应热。
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