变压器油为什么要进行过滤？

制动器电磁铁的可动铁心与铜套间可加入（）润滑

A、机油

B、凡士林

C、黄油

D、石墨粉

肾的主要生理功能有（）

A.生成尿液

B.排泄含氮代谢产物和毒素

C.维持水电解质平衡

D.重吸收一些有用的物质如葡萄糖蛋白质

E.分泌多种血管活性与非血管活性激素

某机器设备原始成本为100000元，报废时残余价值估计为6000元，该设备运转费用每年比前一年增加650元，试用低劣化数值法，求此设备的经济寿命和设备在最佳使用年限中的年均设备总费用。

（共5小题；每小题2分，满分10分）

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。

It is your skin that keeps your insides from falling out. It helps you warm up when you are cold, and it can cool you off when you are hot. It lets you feel things by touch.

Like the heart, stomach and brain, your skin is an organ. In fact, it is the largest organ in your body. But it is still easy to take skin for granted.  1  But skin has an important job to do.

Your skin is constantly protecting you.   2  When you take care of your skin, you are helping your skin do its job. And taking care of your skin today will help prevent future problems, like wrinkles(皱纹) and even skin cancer.

3   Keeping your hands clean all the time is especially important because they can spread germs(细菌) to the skin on other parts of your body.

4   Cold or hot water may hurt your skin. Wet your hands, then lather up with a mild  soap (香皂). You should rub everywhere, including the palms, the wrists and the nails. Wash them well, dry thoroughly with a clean towel and you’re done.

You'll also want to use warm water when you take a bath. Use soap to clean your body. Don't forget under your arms and behind your ears! Your face needs attention, especially as you enter puberty(青春期) and the skin on your face gets more oily.  5 

A．One simple way to take care of your skin is to keep it clean.

B．It is a good habit to wash your hands before and after meals.

C．When washing your hands, use water that’s comfortably warm.

D．It keeps infections out of your body and keeps you from getting sick.E.     Unless there’s a problem, your may not think about your skin very much.

F.     Your skin plays a more important role in keeping you healthy during your puberty.

G.    It’s a good idea to wash your face once or twice daily with warm water and a mild soap.

甲状腺手术后单侧喉返神经损伤时会发生（）

A.吞咽困难

B.音调降低

C.饮水呛咳

D.呼吸困难

E.声音嘶哑