皮皮学，免费搜题
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【单选题】
预防Rh血型不符的新生儿溶血症的方法是A.
用抗Rh血清给新生儿进行人工被动免疫
B.
给胎儿输入母亲的红细胞
C.
用过量的抗原中和母亲的抗Rh抗体
D.
用免疫抑制剂抑制母亲产生抗Rh抗体
E.
分娩72小时内给产妇注射抗Rh免疫血清
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】数字信号和模拟信号的特点是( )。
A.
模拟信号大小上、时间上均不连续，数字信号则相反
B.
数字信号大小上、时间上均不连续，模拟信号则相反
C.
数字信号、模拟信号大小上、时间上均不连续
D.
数字信号、模拟信号大小上、时间上均连续
【简答题】电子学研究的对象是载有信号的电信号,按其特点可以分为模拟信号和数字信号。模拟信号的特点是 ,数字信号的特点是 。
【简答题】数字信号的特点是 ,模拟信号的特点是 。
【单选题】They didn't watch the TV play that day, and______.
A.
so did we
B.
we didn't too
C.
so didn't we
D.
nor did we
【单选题】We used to have a discussion, ___?
A.
did you
B.
didn’t we
C.
used we
D.
didn't used we
【单选题】— You didn't wait for Tom yesterday. — Yes, but we ______. He didn't come. [ ]
A.
needn't have
B.
didn't need to
C.
could have
D.
should have
【简答题】We didn’t go fishing because it rained heavily．（改为同义句） We didn’t go fishing________ ________ the heavy rain．
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