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【多选题】雏鸡断喙的注意事项有哪些?
A.
断喙前应检查鸡群健康状况
B.
断喙后可在水中添加多维,以利于缓解应激
C.
断喙后要仔细检查鸡喙断切面是否出血
D.
断喙后要细致管理,饲槽中适当多加饲料,以防鸡只采食导致结痂脱落
【简答题】Many children love to play with snow in winter. But Long Chuan has come to hate it. This year his hometown suffered from snowstorms(遭受暴风雪)for nearly a month. The heavy snow stopped cars and trains, br...
【单选题】螺杆主滑油泵的旁通调压阀不适合用来____。
A.
做安全阀用
B.
大范围调节流量
C.
适当调节工作压力
D.
关排出阀卸压启动
【简答题】某校为了了解学生对世博礼仪的知晓程度,从全校1200名学生中随机抽取了50名学生进行测试.根据测试成绩(成绩取整数,满分为100分)作了统计分析,绘制成频数分布直方图(如图,其中部分数据缺失).又 知90分以上(含90分)的人数比60~70分(含60分,不含70分)的人数的2倍还多3人. 请你根据上述信息,解答下列问题: (1)该统计分析的样本是(______) A、1200名学生; B、被抽取的...
【简答题】如图是连续十周测试甲、乙两名运动员体能训练情况的折线统计图.教练组规定:体能测试成绩70分以上(包括70分)为合格. (1)请根据图中所提供的信息填写右表: (2)请从下面两个不同的角度对运动员体能测试结果进行判断: ①依据平均数与成绩合格的次数比较甲和乙,______的体能测试成绩较好; ②依据平均数与中位数比较甲和乙,______的体能测试成绩较好. ③依据折线统计图和成绩合格的次数,分析哪位...
【单选题】I stopped in several bookstores to ( ) books.
A.
browse
B.
browser
C.
watch
D.
see
【简答题】Even after several weeks, every time I read this little story I start to cry : My sister-in-law teaches physically and mentally handicapped children at a private school in B rooklyn. She recently   21...
【判断题】在分析运放电路时,可以将一般运放当做理想运放来对待。( )
A.
正确
B.
错误
【简答题】I looked at my watch. It was ten to six. There was just ten minutes left before we 1 eave for home. Suddenly the earth began to shake. In no time the shake became very 2 . “Earthquake ( 地震 )!” someone...
【简答题】It was Christmas, and there was a big party in the house. Guests came and went, but the party went on. Then the bell rang. Several people shouted, "Come in!" and a small man opened the front door and ...
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