After completing a question, you can move on, and if you are satisfied with the first two, come and

It could be that the lock is stuck in the door, so find a plier or a wrench and loosen the door a little bit.

There is a pesticide called dichlorvos (note not to buy a fake), that thing is absolutely effective in removing cockroaches, and the effect is quite obvious, because cockroach immunity is too strong, so it is difficult for the general potion to completely eradicate them from the house, just this dichlorvos, I counted it, first mix the medicine in the water and dilute it slightly (about half a washbasin water with a bottle of medicine is about the same) and then get a watering can to pour the mixed potion into it, and then spray it in all corners, remember to wear a mask and gloves before doing these things, The food should be sealed, do not touch, after spraying, no one must be left in the house within 5 hours, after entering the house when it is outdated, you must open the window and open the door to ventilate for a few hours, and wash the place that is often touched by the sprayed person with clean water, for fear that the child will pick his mouth after touching it. So be sure to clean it, this pesticide is used two or three times, and you can't have a cockroach anymore, I hope it can help your friend.

First, determine whether it is a problem with the section switch or the constant current changer.

Yes, but it is better to paint the topcoat after the primer, so that the wear resistance and hardness are much better.

This is a disease, some are kidney deficiency, some are urinary tract infection, bladder, prostate inflammation, in short, you need to go to the hospital for examination.