下钻铤时，应将下放的钻铤立柱拉出靠在指梁（）。绕好兜绳并留出适当的长度将活端固定在”

Many people like animals and keep one or more as pets—dogs, cats and some kinds of birds. If you keep a dog or a cat as a pet, you must know how to look after it. A grown-up(成年) dog needs two meals a day, not more. And it can eat meat, fish, rice and some other things. Dogs like large bones(骨头), but don’t give them chicken bones. Remember to give them much clean water.   A dog should have a clean, dry box for sleeping. Washing it once a week is good for its health. If it is ill, take it to a doctor. A healthy dog will bring you more pleasure.

Be careful when you have chosen a cat. It has two meals a day with some meat or fish. Cats drink a little milk every day. Sometimes give them vegetables to eat. Don’t forget that they need clean water to drink.

Take good care of your pets. They will be your good friends. Maybe they can give you some help when you need.

小题1:Many people keep ____ as pets.

A．pandas

B．elephants

C．chickens

D．cats小题2:What do dogs like eating?

A．All the bones.

B．Big bones.

C．Chicken bones.

D．Small bones.小题3:A healthy dog can ____ you happy.

A．make

B．give

C．take

D．bring小题4:Cats usually drink ____.

A．orange

B．milk

C．water

D．milk and water小题5:Will pets be people’s friends?

A．No, I don’t think so.

B．Yes, but only a little.

C．Yes, they will.

D．No, they won’t.

下列有关氨的叙述中，正确的是 [ ]

A．氨气易溶于水，可以用来做喷泉实验

B．氨水的密度比水小，且浓度越大，其密度越大

C．可用向上排空气法收集氨气

D．氨易液化，工业上可用氨作制冷剂

医疗上用的抑酸剂是为了减少胃液中的盐酸而使用的药物，抑酸剂种类很多，你认为下列物质肯定不适合作抑酸剂的是[ ]

A．碳酸钙

B．氢氧化铝

C．生石灰

D．小苏打

两人套制管丝头时，要相互配合好，动作协调一致，避免发生事故。

交流超导电缆的交流损耗一般可分为（）。

A.电阻损耗

B.磁滞损耗

C.涡流损耗

D.耦合损耗