题干

设函数f (x)=(x+1)lnx﹣a (x﹣1)在x=e处的切线与y轴相交于点(0,2﹣e).
上一题 下一题 0.0难度 选择题 更新时间:2019-11-19 05:14:27

答案(点此获取答案解析)

同类题3

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

               There are simple ways to organize and clean sports gear (设备). It just takes a little extraeffort, along with some tricks. Here are some tips.

Organizing sports gear

           For children playing different sports, have gym bags in different colors for eachsport—basketball gets green, soccer gets red, baseball gets blue. ____ As forwhat to do with the soccer ball or baseball bat that comes home, keep itemscontained to one spot in the garage. Overhead shelves and nets work well forout-of-season items, too. They are out of theway but still in sight.

Cleaning sports gear

        Most  items can go in the washing machine. Use warm water, and always air-dry. For padded items with plastic,put them in a mesh laundry washing bag or a pillow case with a zipper. ____

●Gym bags

____It's body odor. You played soccer, or basketball, or fencing, and you sweat.Prevent odor from building up by putting used fabric softener sheets in thebag, or spraying the inside of the bag with aerosol deodorant. This also workswell for padded helmets, where sweat gathers.

●Water bottles

           Wate rbottles often get a moldy, damp smell after a sports season or two. If you havereally cleaned it, if you've used a scrub brush, you may have scratched theplastic. ____ Try using vinegar, which is safe and environmentally friendly, tokill mold and mildew.

●Hats

         The   easiest way to clean a baseball cap is to put it in the dishwasher. Then takeit out and air-dryit. If you want to make sure the cap keeps a rounded shape, dry it over acoffee can. ____ Another option is to use shampoo, which is designed to breakdown body oil.

a.As we all know, they smell.

b.It's necessary to clean a sport gearafter every practice.

c.You can also put it on a blown-up balloon.

d.This protects the machine, and theequipment from getting scratched.

e.Those tiny little scratches are wherebacteria can get, and cause that smell.

f.Don't let children stuff clothing intheir bags.

g.So when they're rushing from oneactivity to the next, it's easy to grab the correct gear.