“采集和测算空气中的尘埃粒子”这一探究实验,采用的是五点取样法,正确的五点取样法

题型:选择题

问题:

“采集和测算空气中的尘埃粒子”这一探究实验,采用的是五点取样法,正确的五点取样法是[ ]

A.

B.

C.

D.

考点:科学研究方法
题型:选择题

用括号内单词的正确形式填空。

     Mr. Clark __1___ (come) from England.  He __ 2__ (work) in a middle school in Yunnan.  He

_  3__ (go)to work five days a week. He __4__ (like) his students and _  5_ _ (teach) them a lot of

things. He likes __6__ (play)games with his students. His students __7   _ (like)him, too. He can __8__

(speak) a little Chinese.He __9__ (talk) to his students in English and _10__ (watch)TV with them on

Sundays.

题型:选择题
下列事例中,能说明分子间存在引力的是(  )

A.铁块难以被压缩

B.铁丝难以被拉断

C.打开的香皂,能闻到香味

D.磨光的铅片和金片,在室温下压紧五年后,可以相互渗入约1mm深

题型:选择题

刑事侦查情报研究报告中的主体,即核心部分是_________。

题型:选择题

跨区间无缝线路的养护维修工作重点是什么?

题型:选择题

压力温度计的表头应装在易于观察的地方,表头和金属软管的环境温度应在( )℃范围内。

A.0~50

B.5~50

C.10~80

D.10~100

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