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【判断题】
非随机抽样的方式主要有判断抽偶遇抽样、滚雪球抽样和定额抽样A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】债券的偿还期限是指债券从发行之日起至偿清本息之日止的时间。（ ）
【简答题】---Hello,______ ---It must be about two years since we last met. What have you been doing with yourself? --- I've been doing all sorts of things. A.I haven't seen you for ages B how long have you been...
【多选题】电梯作用于底坑的撞击力存在以下几种情况： 。
A.
轿厢由安全钳通过导轨传至底坑
B.
对重由安全钳通过导轨传至底坑
C.
轿厢通过缓冲器传至底坑
D.
对重通过缓冲器传至底坑
【单选题】听力原文：M: Hey, Nancy! I haven't seen you for a while. What've you been doing with yourself? W: Oh, hi John. I've been studying a lot lately. All of my classes seem to have exams during the same week. M:...
A.
Because she failed her last exam.
B.
In order to complete her homework.
C.
In order to prepare for her exams.
D.
Because she has fallen behind in her work.
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