皮皮学，免费搜题
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搜题
【单选题】
真核生物染色体中具反转录作用的是A.
连接酶
B.
端粒酶
C.
反转录酶
D.
末端转移酶
E.
拓扑异构酶
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I’m examining the composition he finished ______ the possible mistakes init.
A.
to correct
B.
correct
C.
corrected
D.
correcting
【单选题】听力原文：W: Have you found anything wrong with my stomach? M: Not yet. I am still examining. I'll let you know the result next week. Q: What is the probable relationship between the man and the woman? (14...
A.
Husband and wife.
B.
Father and daughter.
C.
Doctor and patient.
D.
Teacher and student.
【简答题】MCS-51单片机采用12MHZ晶振时,它的机器周期(____),ALE引脚正脉冲频率为(____)。
【单选题】听力原文：W: Have you found anything wrong witi my stomach? M: Not now. I'm still examining. I'll let you know the result next week. What's the possible relationship between the two speakers?
A.
Doctor and patient.
B.
Husband and wife.
C.
Teacher and student.
D.
Father and daughter.
【简答题】MCS-51 单片机采用12MHz晶振时,ALE引脚正脉冲频率为 ___ _ _______ MHz ,定时器的定时脉冲是_ _ __us。
【简答题】若MCS-51 单片机采用12MHz 的晶振,它的机器周期( ) μm ,ALE 引脚输出正脉冲频率为( ) MHz 。
【单选题】听力原文：W: Have you found anything wrong with my stomach? M: Not yet. I am still examining. I'll let you know the result next week. What is the probable relationship between the man and the woman?
A.
Husband and wife.
B.
Father and daughter.
C.
Doctor and patient.
D.
Teacher and student.
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