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【单选题】
临床试验与队列研究的主要区别是A.
研究组与对照组大小相等
B.
研究是前瞻性的
C.
研究者是否控制研究因素
D.
研究组与对照组具有可比性
E.
设立对照
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【简答题】Task 2 (10 points) Directions: In this task there is a passage followed by an incomplete outline. You should read the passage carefully and fill in each blank with no more than three words . 阅读文章,然后填空...
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following paragraph. My cousin, Anna, is a university student in Chicago.
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【单选题】Refer to the exhibit. What is the sequence of s when a VoIP call is placed from IP phone P1 to IP phone P2？ （）
A.
RTP traffic is exchanged between IP phone P1 and IP phone P2. IP phone P1 alerts the CCM of off-hook state. CCM instructs IP phone P1 to provide dialtone. IP phone P1 passes digits to CCM. CCM routes call to PSTN or IP phone P2.
B.
CCM instructs IP phone P1 to provide dialtone. IP phone P1 alerts the CCM of off-hook state. IP phone P1 passes digits to CCM. CCM routes call to PSTN or IP phone P2. RTP traffic is exchanged between IP phone P1 and IP phone P2.
C.
CCM instructs IP phone P1 to provide dialtone.IP phone P1 alerts the CCM of off-hook state. IP phone P1 passes digits to CCM. RTP traffic is exchanged between IP phone P1 and IP phone P2. CCM routes call to PSTN or IP phone P2.
D.
IP phone P1 alerts the CCM of off-hook state. CCM instructs IP phone P1 to provide dialtone. IP phone P1 passes digits to CCM. CCM routes call to PSTN or IP phone P2. RTP traffic is exchanged between IP phone P1 and IP phone P2.
【简答题】Fill in the blanks with words or phrases from the box below.Change the form where necessary. Pursuit folk motivation be big on all the way takeover elementary hook predict 1 . I'm a tech fan and _____...
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