为了了解省内生产的服装产品质量,对主要的几个大型服装企业的产品质量进行了调查,则该项

题型:单项选择题

问题:

为了了解省内生产的服装产品质量,对主要的几个大型服装企业的产品质量进行了调查,则该项调查活动是属于()

A、普查

B、典型调查

C、重点调查

D、抽样调查

考点:统计学原理统计学原理题库
题型:单项选择题

连铸坯鼓肚是造成铸坯严重中心偏析的重要原因。

题型:单项选择题

句型转换.

1. The box is so big that he can't carry it.

    The box is _____ big _____ him _____ carry.

2. Joho said to Mary, "Could you pass me the sugar?"

    John _____ Mary _____ she could pass_____ the sugar.

3. The speaker raised his voice in order that the listeners in the back row could hear him.

    The speaker raised his voice _____ _____ the listeners in the back row could hear him.

4. He didn't have breakfast and went to school.

    He went to school _____ _____.

5. She said, "I have waited for nearly two hours." 

    She said that _____ _____ waited for nearly two hours.

题型:单项选择题

高分子材料具有的优点有()。

A.良好的绝缘性

B.耐腐蚀性强

C.耐热性较高

D.韧性好

题型:单项选择题

将SO2气体通入氯气的水溶液中至恰好完全反应,生成两种常见的酸。

(1)完成上述反应的化学方程式:Cl2+SO2 +2H2O==           +2HCl

(2)某同学为了证明所得混合酸中含有的两种酸根离子,设计实验加以确认,加入试剂的顺序依次是①为             ;②为              

题型:单项选择题

有机磷酸酯类中毒时,M样症状产生的原因是()

A.胆碱能神经递质释放增加

B.M胆碱受体敏感性增强

C.直接兴奋M受体

D.胆碱能神经递质破坏减少

E.抑制Ach摄取

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