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【简答题】
mother motherly a. She took her _____________ duties very seriously. b. She’s an English teacher and a _________ of two children. 2. survive survival a. Camels can __________ for many days with no water. b. The man was caught up every day in the struggle for __ . 3. interference interfere a. We oppose _____________ by any outside force. b. Anxiety can _________ with one’s performance in exams. 4. please ( v. ) please ( ad. ) a. Can you help us _____________ ? b. She did everything she could to _____________ him. 5. spot spotless a. This shirt has a _____________ on the cuff. b. It’s difficult for the mom to keep this house _____________.
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【简答题】4 GHz 频段中国规定的工作频率是哪个范围()? A.2.4 GHz-2.4835 GHzA. 2.471 GHz-2.497 GHz B. 2.4465 GHz-2.4835 GHz C. 2.445 GHz-2.475 GHz D. A.2.4 GHz-2.4835 GHz
【简答题】燃气涡轮发动机燃烧室的作用是（）。
【单选题】两个样本率差别的假设检验,其目的是()
A.
目的是推断两个总体率是否相等
B.
推断两个样本率有无差别
C.
推断两个样本率与两个总体率有无差别
D.
推断两个样本率和两个总体率的差别有无统计学意义
E.
推断两个总体分布是否相同
【简答题】【图片】注：请用半角英文符号输入答案，不要含有空格！注：请用半角英文符号输入答案，不要含有空格！注：请用半角英文符号输入答案，不要含有空格！