【判断题】报检员有权拒绝办理所属企业交办的单证不真实、手续不齐全的报检业务。( )
【简答题】1-11. 乙醚和正丁醇具有相似的水溶性,但二者沸点相差极大,为什么? Diethyl ether and 1-butanol are isomers, and they have similar solubilities in water. Their boiling points are very different, however. Explain why these two compou...
【简答题】《宗子相 1 集》序 (明)王世负 呜呼!此广陵宗臣子相之诗若文。武昌吴国伦传之,而吴郡王世贞为之序,曰:昔在建安,二曹龙奋,公转角立。爱至潘陆衍藻,太冲修质,沈宋丽尔,必简岳岳,李杜并驱,龙标脱衔。古之豪杰于辞者,往往志有所相合而不相下,气有所不相入而相为用, 则岂尽人力哉?盖亦有造物微旨矣。 日,余与李攀龙于鳞燕中游也,子相抉吴生暨天目徐生来。子相才高而气雄,自喜甚,尝从吴一再论诗,不胜,覆酒...
【单选题】Northern Blot 是用来检测()。
【简答题】根据以下资料,按照报关单填制规范的要求,回答13~26题。
【单选题】Northern blot是利用核素标记的()来检测特异性RNA序列的一种方法。主要用于检测特异性mRNA,以分析该基因的表达状况。
【单选题】【图片】Ionic solids tend to be very stable compounds. The enthalpies of formation of the ionic molecules cannot alone account for this stability. These compounds have an additional stability due to th...
A.
The dissociation of a compound is always an endothermic process .
B.
the heat of formation of a compound may be positive or negative
C.
The overall change in energy of a process can be determined by breaking the process down into steps , then adding the changes in energy of each step .
D.
Sublimation energy, the energy required to cause a change of phase from solid to gas, by passing the liquid phase. has always a positive value
【多选题】868,老子的《道德经》开篇一句:道可道,非常道!这句话在沙盘经营中给出的启示是()。