如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（ ） A．5A

Australia has an unusual kangaroo—although he is a pet, he lives like a man. He is dressed in clothes, likes watching TV and drinking, also eats bread, plays football and does some exercise.

His name is Bi Muer. Months ago, a 50-year-old woman, Julia Bradley adopted (收养) him. He now lives a happy life. Every morning, he can enjoy delicious bread and later watch TV with his "mom". In the afternoon, he can go to the garden and play football and in the evening, he can drink while watching TV.

In the beginning, Muer was only 20cm tall, but now, he can easily jump over a one-meter fence.

小题1: The kangaroo likes______________.

A. watching TV and drinking B. seeing a movie   C. playing basketball

小题2:Who adopted the kangaroo?

A. Bi Muer. B. Julia Bradly.    C. Bill Smith.

小题3:What can the kangaroo do every morning?

A. Drink.  

B. Go to the garden.

C. Enjoy delicious bread and watch TV.

小题4:How tall was the kangaroo in the beginning?

A. 10cm.    B. 20cm.    C. 30cm.

小题5:The passage is mainly about    .

A. An unusual kangaroo 

B. An Australia woman

C. A kangaroo' s hobbies

慢性缩窄性心包炎，手术指征最强的临床表现是（）

A.胸部X线检查显示心包钙化

B.心电图显示QRS波低电压

C.超声心动图显示心包腔内积液

D.心导管检查显示右房右室舒张压升高

E.周围静脉压明显升高

在关系模型中，为了实现“关系中不允许出现相同元组”的约束应使用

A．临时关键字

B．主关键字

C．外部关键字

D．索引关键字

我国四个地理区域中没有大盆地分布的是[ ]

A、北方地区

B、南方地区

C、西北地区

D、青藏地区

国家七部委关于建立健全减负“五项制度”的具体内容是什么？