1, Which of the following pencil lead is the hardest?

2, A discovery made from pencil lead is promising to change the future of the electronics industry.

3, Ordinary so-called pencil lead is graphite, a three-dimensional form of carbon.

4, Product: movable pencil lead Type: PCRed yellow blue white four colours, bulk supply.

5, The location analysis results of the pencil lead breaking test on thermal barrier coating showed the accuracy of this method.

6, The graphite needed to make pencil lead was found mostly in England and Prussia.

7, The color of an HB pencil lead is too light to be read by the machine.

8, Pencil Lead, Eraser, Glue, Pencil, An Pen Clip, Clipper Stationery.

9, The wall was covered with scrawls done with a bit of pencil lead.

10, Layers of graphene make up the graphite found in pencil lead.

11, Structurally, the appendix is isolated from the rest of the gut, with an opening smaller than a pencil lead,(http:///pencil lead.html) protected from the fecal stream that might be carrying pathogens.

12, Lovely aromatics of Emperor Cherry, blackberry, and cedar in the nose underscored with a subtle hint of pencil lead shavings.

13, Experiments were carried out on sheet metal with the signal of pencil lead breaking as simulating source.

14, He found inspiration in an unlikely place: the physics of condensed matter, including the material of the moment - pencil lead.

15, After experimenting for eight days, he discovered that firing powdered graphite with clay would work, and the hardness of the pencil lead could be varied by varying the ratio of graphite to clay.

16, The company founds in 1992, Is melts the metal penstock, the pencil lead, the pen tip, the pen cap, the pen circle and the end product processing is a body specialized business Enterprise.

17, Bouquet: It offers up an alluring bouquet of pain grille, pencil lead, and black cherry.

18, To his surprise, he discovered that the carbon in the candle wax had formed all four types of pure carbon, including diamonds and graphite, or pencil lead.

19, Each one was grooved to half the thickness of a pencil lead. Two slats were glued together with the lead between.