1、小明利用最小分度值为1mm的刻度尺测量一个物体的长度,三次测量的数据分别为2.35cm、2.36cm、2.36cm,则测量结果应记为( ).(单选题)
A. 2.36cm
B. 2.375cm
C. 2.35cm
D. 2.4cm
试题答案:A
2、将7.8g过氧化钠加入到92.2g水中,所得溶液中溶质的质量分数是( ).(单选题)
A. 8%
B. 7.8%
C. 8.13%
D. 16.26%
试题答案:C
3、I _____ writing the article by the time you get back.(单选题)
A. shall finish
B. must have finished
C. have finished
D. shall have finished
试题答案:D
4、The relationship between employers and employees has been studied(单选题)
A. originally
B. extremely
C. violently
D. intensively
试题答案:D
5、获2015年科技创意大赛一等奖的“校园脚踏式发电装置”,是利用脚踩踏板带动线圈运动发电的,下图能反映其工作原理的是( ).(单选题)
A.
B.
C.
D.
试题答案:B
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