被控对象的干扰通道和控制通道的共同点是()。A、都是被控对象的输入信号 B、都是被控

题型:单项选择题

问题:

被控对象的干扰通道和控制通道的共同点是()。

A、都是被控对象的输入信号

B、都是被控对象的输出信号

C、二者的通道特性是相同的

D、信号联系的目标都是被控变量

考点:仪表工考试仪表维修工初级仪表维修工初级题库
题型:单项选择题

背诵。

1. Young children might            Superman or Batman while adults might picture a doctor or police officer.

2. Beth            a respiratory problem which made it difficult for her to breathe.

3. She grew up in and out of hospitals where she                 devices to help control her illness.

4. But she was determined, and when her eleventh birthday            , Beth was there to          her candles.

5. She proved the doctors wrong but, even though she lived past the       , she still wasn't       .

6. Beth went through several more years of nurses and doctors poking her like      but she never

    complained.

7. With all she had to deal with, you would think she would be too busy to listen to her

     friends'        -nevertheless she always found time

题型:单项选择题

某地区有小学150所,中学75所,大学25所.先采用分层抽样的方法从这些学校中抽取30所学校对学生进行视力调查,应从小学中抽取______所学校,中学中抽取______所学校.

题型:单项选择题

病虫害的主要防治技术有()。

A、植物检疫

B、园艺防治

C、生物防治

D、物理防治

E、化学防治

F、营养调节防治

题型:单项选择题

眉刷的毛质应选择质地()

A.较散

B.较软

C.较紧

D.较硬

题型:单项选择题

根据出料加工管理规定,在以下四种情况中,不能申办出料加工手续的是( )。

A.国内尚无达到产品质量要求的加工企业

B.国内虽具备生产能力和技术条件,但加工费用较国外高

C.国内尚不具备加工设备

D.国内的技术手段无法达到产品质量要求

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