题目内容

用万分之一分析天平称量时,下列读数正确的是( )

A. 2.1305
B. 2.132
C. 2.13
D. 2.1

查看答案
更多问题

pH = 5.26中的有效数字是( )位

A. 0
B. 1
C. 2
D. 3

滴定管读数时,应记录至小数点后第( )位

A. 1
B. 2
C. 3
D. 4

将数据2.8388,0.284401,2861.5,0.044685001修约成四位有效数字,下列各组修约正确的是( )

A. 2.838,0.2844,2862,0.04469
B. 2.839,0.2845,2862,0.04469
C. 2.839,0.2844,2861,0.04469
D. 2.839,0.2844,2862,0.04469

下列属于四位有效数字的数据是( )

A. 0.0200
B. 1.0×10-3
C. 12.1
D. 0.1021

答案查题题库