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【单选题】
( ) 是指一类能刺激机体免疫系统使之产生特异性免疫应答,并能与相应免疫应答产物抗体和致敏淋巴细胞在体内或体外发生特异性结合的物质。A.
抗体
B.
抗原
C.
补体
D.
免疫
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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】下列哪一项不属于观察法的特点？
A.
观察方案设计得好可以增加信息的准确性
B.
信息可以在正常实地情况下获得
C.
不依赖于实际观察者的交流能力
D.
观察的行为具有连续性
【简答题】已知函数 与 的定义域为 ，有下列5个命题： ①若 ，则 的图象自身关于直线 轴对称； ② 与 的图象关于直线 对称； ③函数 与 的图象关于 轴对称； ④ 为奇函数，且 图象关于直线 对称，则 周期为2； ⑤ 为偶函数， 为奇函数，且 ，则 周期为2。 其中正确命题的序号为 。
【单选题】Have you ever heard the old saying 'Never judge a egg by its shell'? This is a good rule to follow when trying to judge the intelligence(智力) of others. Some people have minds that shine only in certai...
A.
a good writer is always a good speaker
B.
a good writer may not be a good speaker
C.
a good writer will find himself speechless
D.
a speechless person always writes well
【单选题】Do you agree to the old saying ______ absence makes the heart grow fonder?
A.
since
B.
when
C.
that
D.
as
【单选题】Have you ever heard the old saying 'Never judge a egg by its shell'? This is a good rule to follow when trying to judge the intelligence (智力) of others. Some people have minds that shine only in certa...
A.
a good writer is always a good speaker
B.
a good writer may not be a good speaker
C.
a good writer will find himself speechless
D.
a speechless person always writes well
【单选题】The old saying that you should live each day_________it was your last is a nice view.A．only ifB．e
A.
34．The old saying that you should live each day_________it was your last is a nice view. A．only if
B.
even if
C.
as long as
D.
as though
【简答题】已知抛物线 与y轴交于点C,则点C的坐标是（ ）；若 点C′是点C关于该抛物线的对称轴对称的点，则 点的坐标是（ ）.
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