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【简答题】
已知随机变量X的密度为 ,且 ,则 ________ ________
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【简答题】在调速性能指标要求不高的场合,可采用()直流调速系统(A)电流,电压正反馈 (B)带电流正反馈补偿的电压负反馈(C)带电流负反馈补偿的电压正反馈 (D)带电流负反馈补偿的电压负反馈A.B.C.D. D
【单选题】The purpose of the outline is to enable the students to have a clear organization of ideas and a structure that can guide them ( ).
A.
in the actual writing
B.
in free writing
C.
in controlled writing
【单选题】The passage describes an ideal lecture as ______.
A.
giving a clear, general outline of the topic
B.
helping students understand difficult points
C.
having a clear purpose, focus, and development
D.
being clearly spoken, interesting, and knowledgeable
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