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【单选题】
300K时,某一等温过程的 , ,则 ( )。A.
－66.93
B.
－18.40
C.
66.93
D.
703
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【简答题】虽然跑步在日常生活中经常看见,但是我们可能从来没有仔细的分析每一个动作。根据下图 走路和跑步, 请临摹如图 跑步关键帧图(拍照附件上传),并从 脚离地、关键帧姿势、身体重心 等角度简述跑步和走路的主要区别。 相关资料链接 http://blog.sina.com.cn/s/blog_6b5953170100wgji.html
【多选题】Regarding the ML decision rule for signal transmissions over AWGN channel, the statements _______________ are correct.
A.
The ML decision rule is to choose the message point closest to the received signal point.
B.
The ML decision rule always equals to the MAP rule.
C.
The MAP and ML decision rules can be conditionally equivalent.
D.
The ML decision rule can minimize the probability of error.
【多选题】Comparing QPSK and BPSK transmitted over AWGN channel, _______________.
A.
QPSK can achieve the same bit error rate as BPSK.
B.
QPSK can achieve the same symbol error rate as BPSK.
C.
the bandwidth efficiency of QPSK is the same as that of BPSK.
D.
the bandwidth efficiency of QPSK is twice that of BPSK.
【简答题】上传跑步姿势照片
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