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【单选题】
水螅的生殖腺来源于A.
内胚层
B.
外胚层
C.
中胚层
D.
中胶层
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反馈参考答案：
举一反三
【单选题】The number of traffic accidents caused by drinking is ____ as the number of those caused by non-drinking driving．
A.
as twice many
B.
many as twice
C.
as twice large
D.
twice as large
【简答题】转速(转动的频率)是( ),其单位为r/s或r/m(RPM)。
【简答题】简单描述OSI七层参考模型各层的主要工作及功能
【简答题】一个 IPv4地址是由网络号 和 号两部分组成的。
【单选题】The hypothesis that the explosion was caused by a rock colliding with the Earth
A.
has remained a puzzle
B.
lacks sufficient evidence
C.
is a university professor
D.
was generated by the explosion
E.
will kill many animals
F.
are attacked by aliens
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