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【单选题】
如图所示电路，则图中a节点的电位Ua和电流I分别为 ( ) A . 10V、1A B. -10V、1A C. 1V、1.2A D. 12V、1A【图片】A.
A
B.
B
C.
C
D.
D
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举一反三
【单选题】下列关于组胺的描述哪一点是正确的( )
A.
组胺能收缩小动脉和毛细血管
B.
人口服大量组胺可引起严重毒性反应
C.
组胺受体与儿茶酚胺、5-HT等受体有特异性区别
D.
引起胃液分泌的组胺受体与血管平滑肌上的组胺受体一样
E.
少量组胺皮下注射增加胃液分泌,并伴有血压明显变化
【单选题】听力原文：M: Look, Lynn, I think I have to make our meeting on 18th of October to another day. You see, I have to go out to our branch office in Los Angles to attend the opening ceremony. W: Em, yes, let m...
A.
B.
【单选题】—Hi, Susan, you look tired. —I ______ for months for the coming celebration for the school’s 60th anniversary.
A.
was preparing
B.
have been preparing
C.
had prepared
D.
prepare
【单选题】—Hi, Susan, you look tired. —I for months for the coming celebration of our school’s 90th anniversary.
A.
was preparing
B.
have been preparing
C.
had prepared
D.
prepare
【单选题】---Mr. Wu, can I have a look at the scores? ---Well, you are a senior, so I_____ hardly remind you that the scores are not open to students.
A.
can
B.
need
C.
will
D.
shall
【单选题】听力原文：M: Look, Lynn, I think I have to make our meeting on 18th of October to another day. You see, I have to go out to our branch office in Los Angles to attend the opening ceremony. F: Em, yes, let m...
A.
B.
C.
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