1, concave

Vertical and horizontal folding, vertical and horizontal folding.

2. Convex

The first stroke is left vertical, then short vertical, then cross-folded, and finally long horizontal.

On "concave" sentence-making;

1. Reservoirs are mainly distributed in Huimin sag, eastern Chezhen sag, Gubei area in northwest Zhanhua sag and parts of Dongying sag.

2. A thrust plate arranged below the shaft, the thrust plate having a concave portion formed with a concave curved surface contacting the end of the shaft.

3. After leveling the concave plate, tighten the shackle support nut and the connecting bolt to make the concave plate and the concave plate bracket closely contact (but not too tightly).

4. Jiancaoping Branch of Shanxi Provincial Environmental Protection Bureau investigated and dealt with a small earth ironmaking furnace that was being illegally produced in Yishan 'ao, Taiyuan City.

On "convex" sentence-making;

1, the ground is a kind of bronze, paved with unknown stones, with exquisite inscriptions on it. It looks concave and convex, but it feels smooth and smooth, which can be learned by people.

2. Using the difference quotient to replace the exact derivative which is difficult to calculate, and combining with the idea of reduced gradient method, a new algorithm is established; Under the condition that the objective function is uniformly convex, the global convergence of the reduced difference business method is proved.

3, and the words and deeds of business people as the basis for judging their ability. Whether wine is refreshing, skilled and pleasing to everyone may be endowed with meaning far beyond itself.

4. Life is like a newly opened diary, blank, but it was written so strongly yesterday that it penetrated the back of the paper, leaving uneven marks on this page today. If you are not careful, you will see the back of the past. Maybe a new story written on it can cover everything up. Before it rains tomorrow.

Under the subset-the character part is convex. Kangxi strokes: 5. Outward stroke: 3.

Tang Yun was cut from a bone, but Ji Yun was not cut. Dolphins entered the bay. Appearance. Du Fu's Poems are hard to win because of their clouds. The wine in Du Mu's poems is heart and light. And in popular literature, the flesh is prominent and the tumor is called.