【单选题】预防砌筑砂浆和易性差沉底结硬的措施不包括( )
【简答题】按着有效数字规则,某圆柱体的体积运算式为【图片】,则计算结果体积应取位有效数字。
【简答题】按着有效数字规则, 96.25+1.342=
【单选题】---I am going to the supermarket to buy a quilt. --- ________ You can easily buy one on the Internet.
【简答题】What can you do on the Internet? Many of us like to read the news, buy things and play s. Some students now have a new use for the Internet – helping them with their homework. Tina, 14, from She...
【判断题】数据检查结果出现错误时,当错误对分析没有显著影响时,方进行后续分析计算。
【简答题】The+ -er +S + V; the + -er + S + V; The + more + Adj + S + V; the + more + Adj + S + V (愈...愈...)
【简答题】按着有效数字规则,某圆柱体的体积运算式为 0.25π×3.168×3.168,则计算结果体积应取 位有效数字 。
【多选题】假定计算出某球体直径的最佳估值为19.9937mm,(1)若计算出其测量不确定度为0.0027mm;(2)若计算出其测量不确定度为0.0017mm。两种情况下,按着有效数字规则,测量结果报道表示方法正确的是
A.
( 1 9 .9937 ± 0.0027 ) mm
B.
( 1 9 .994 ± 0.003 ) mm
C.
( 1 9 .9937 ± 0.0017 ) mm
D.
( 1 9 .9937 ± 0.002 ) mm
【单选题】With the Internet popular, more people________ the Internet to buy and sell items. [ ]