【单选题】最大地面浓度占标率的计算公式中,如果GB3095中没有小时浓度限值的污染物,则c0i可取() A.年平均浓度限值 B.日平均浓度限值 C.日平均浓度限值的二倍值 D.日平均浓度限值的三倍值
【简答题】请完成P49练习四 match the words with the definition enviroment 2. working life 3. strain 4. office aerobics 5. stretch 6. posture a. when a muscle works too hard b. make something longer ...
【单选题】一段粗细均匀的镍铬丝,横截面街是d,电阻是R,把它拉制成直径为d/10的均匀细丝后,它的电阻变为
【判断题】数据流程图描述了系统的分解,即描述了系统由哪几部分组成,各部分之间的联系,并说明了系统中各个成分的含义。( )
【单选题】一段粗细均匀的镍铬合金丝,横截面的直径为 d ,电阻为 R ,如果把它拉成直径为d/4 的均匀细丝,电阻值将变为( )
【单选题】一段粗细均匀的镍铬合金 丝,横截面的直径为d,电阻为R,如果把它拉成直径为 的均匀细丝,电阻值将变为( )
【判断题】一定温度下, 在 BaSO4 溶液中加入 NaNO3会使 BaSO4 的溶解度稍微增大。
【单选题】Match the words with correct definition as follows. incubation ( ) motivate ( ) ideation ( ) diverse ( ) integral ( ) empower ( ) avid ( )
A.
the process of forming and relating ideas
B.
existing as an essential constituent or characteristic
C.
ardently or excessively desirous;marked by interest and enthusiasm
D.
maintaining something at the most favorable temperature for its development
E.
to give power or authority to do something
F.
to give powr an incentive for action
G.
many and different; distinctly dissimilar or unlike
【单选题】在一定温度下向饱和BaSO4溶液中加入少量H2SO4,会发生( )