An invention is a solution to a specific technological problem, which may be a product or a process and generally has to fulfil three main requirements: it has to be new, not obvious and there needs to be an (5).

Arrange the information and put the following information of a letter of complaint in order. (请按照投诉信的步骤排序) A: Describe your purchase B: Your address C: Allow time for the solution D: Salutation E: State the problem of the product F: Finish the letter respectfully G: Ask for specific solution

You should follow “solution---specific action—positive results/drawbacks” pattern when justifying your solution.

Fehling's solution consists solution of A and B, a solution of ____, and a solution of potassium sodium copper tartrate.

The sequence of reagents used in Gram staining is () A: Safranin solution → iodine solution → alcohol →<br/>crystal violet B: crystal violet → alcohol → iodine solution → Safranin<br/>solution C: Crystal violet → iodine solution → alcohol → Safranin<br/>solution D: Safranin solution → alcohol → crystal violet → iodine<br/>solution E: Safranin solution → crystal violet → iodine solution →<br/>alcohol

Transporting the trash to the rural areas is considered as______. A: an effective solution B: a costly solution C: a dangerous solution D: a feasible solution

Compared with plasma, which solution belongs to isotonic solution? ( ) A: 9 g•L-1 NaCl solution B: 90 g•L-1 NaCl solution C: 10 g•L-1 glucose solution D: 6.25 g•L-1 NaHCO3 solution

Which<br/>of the following buffer solutions have the largest buffer capacity? ( ) A: 1L 0.1 M HAc solution + 1L 0.2 M NaAc solution B: 1L 0.15 M HAc solution + 1L 0.15 M NaAc solution C: 1L 0.1 M HAc solution + 1L 0.1 M NaAc solution D: 1L 0.2 M HAc solution +1L 0.1 M NaAc solution

How to make a specific purpose specific and clear? A: express the specific purpose as a statement B: express the specific purpose as a question C: put the specific purpose as a full infinitive phrase D: put the specific purpose as a full declarative sentence

Which of the following properties have nothing to do with the dependence of the aqueous solution? A: The vapor pressure of the aqueous solution drops B: The freezing point of the aqueous solution decreases C: Different cations in aqueous solution show different colors D: The boiling point of the aqueous solution rises