【多选题】水泥混凝土路面施工按弯拉强度作混凝土配合比设计,下列对于混凝土配合比表述正确的是( )。
A.
应保证混凝土的设计强度、耐磨、耐久及拌合物的和易性,在冰冻地区还要符合抗冻性要求
B.
根据不同摊铺方式和细集料的种类有所不同,拌合物摊铺坍落度取值范围为0~65mm
C.
当细集料均干燥时,混凝土的单位用水量,采用碎石为145~170kg/m 3
D.
混凝土的砂率,应根据砂细度模数和粗集料种类从规范中查表取值,取值范围为28%~42%
【简答题】试证两个相同材料的薄凸透镜组合消放大率色差的条件是 ,式中d表示两薄透镜的间距。
【简答题】以陕北民歌“信天游”的形式写成的抒情诗的代表作是()。
【单选题】Analyze the following statement, and then choose one of the options that you think is best to use in academic writing:These results suggest a possibility that CTD could change its position relative to...
A.
These results suggest that under specific conditions, CTD changes its position relative to NHL domain
B.
We assume that these results suggest that CTD could change its position relative to NHL domain under certain conditions.
C.
These results might suggest that CTD changes its position relative to NHL domain, at least under certain conditions.
D.
We believe that CTD could change its position relative to NHL domain under certain conditions.
E.
These results make us believe that CTD could change its position relative to NHL domain.
【单选题】与肌肉组织比较,肝脏能够将糖原直接分解为葡萄糖,主要具有下列特殊的酶活性
【多选题】从中药水提取液中萃取亲脂性成分,常用的溶剂是
【多选题】从中药水提取液中萃取亲脂性成分,常用的溶剂是
【单选题】薄透镜表示( )。
C.
镜片厚度远小于透镜两个曲率半径中最大的那个曲率半径
D.
镜片厚度远小于透镜两个曲率半径中最小的那个曲率半径
【简答题】以陕北民歌“信天游”的形式写成的抒情诗代表作是《 》。建国后,其诗歌类型分为两类,一类是 ,如《桂林山水歌》;一类是长篇政治抒情诗,如《雷锋之歌》。
【多选题】从中药水提取液中萃取亲脂性成分常用的溶剂有