在市场经济条件下，价值是调节供给与需求平衡的最重要的机制。( )

阅读理解。阅读短文，判断正(T)误(F)。

(

                                                     How to use the computer?

     Today my father buys a computer for me. It has a keyboard, a monitor, a mouse and a printer. I'm very

  happy because I can download some information from the Internet and print my homework. Do you

 know how to use the computer? Let me tell you!  First, switch on the computer.

     Then click "new document". Next you can write what you want in the new document. When you write,

  you should click "save" again and again. 

     Sometimes I like to have a travel to some beautiful places at weekends. I can check the train timetable

  on the computer. I love the computer!  What about you?

( ) 1. A computer has a keyboard, a monitor and a printer.

( ) 2. The writer knows how to use a computer.

( ) 3. The writer likes travelling.

( ) 4. The writer's mother buys her a computer.

(     ) 5. The writer can use the computer to do her homework.

初春时节，柳树发芽，你可以折一根柳条，把皮和芯拧松，抽出木芯，用刀把嫩皮的两端修齐，就制成了“柳笛”。用力吹，柳笛就发出声响。相比较来看，细而短的柳笛吹出声音的音调较高，该声音是由于_________的振动而产生的。

为增加冒口的补缩效果，沿冒口补缩距离，向着冒口，铸件断面逐渐增厚的多余金属称为（）。

A.工艺补正量

B.加工余量

C.补贴

D.冷铁

下列说法正确的是（）

A．Th是辅助性T淋巴细胞

B．Tc是反抑制性T细胞

C．Td是抑制性T细胞

D．Ts迟发反应性T细胞

E．Tcs杀伤性T细胞

与结节病相比较，肺门淋巴结结核的特点有（）

A.患者较年轻

B.肺门淋巴结肿大一般为单侧性

C.结核菌素试验多为阳性

D.常有中毒性症状

E.可见肺部原发病灶