泵进行流量调节时，变更管道特性曲线的方法是（）。A、汽蚀调节 B、变速调节 C、导叶

____, the meat can't put into market. [ ]

A. Having not been examined

B. Not having examined

C. Having not examined

D. Not having been examined

我国最早的纸币是出现于（    ）

A．唐朝

B．北宋

C．明朝

D．元朝

（1）           ，             。登东皋以舒啸，临清流而赋诗。（陶渊明《归去来兮辞》）

（2）        ，响穷彭蠡之滨；雁阵惊寒，         。(王 勃<<滕王阁序>>)

（3）但以刘日薄西山，        ，        ，朝不虑夕。（李密《陈情表》）

（4）子曰：“由，诲女知之乎？        ，不知为不知，           。”（《论语·为政》

A recent poll indicated that half the teenagers in the United States believe that communication between them and their parents is (1) and further that one of the prime causes of this gap is (2) listening behavior. As a(an) (3) in point, one parent believed that her daughter had a severe (4) problem. She was so (5) that she took her to an audiologist to have her ear tested. The audiologist carefully tested both ears and reported back to the parent:"There’s nothing wrong with her hearing. She’s just (6) you out. "

A leading cause of the (7) divorce rate (more than half of all marriages end in divorce) is the failure of husbands and wives to (8) effectively. They don’t listen to each other. Neither person (9) to the actual message sent by the other.

In (10) fashion, political scientists report that a growing number of people believe that their elected and (11) officials are out of (12) with the constituents they are supposedly (13) Why Because they don’t believe that they listen to them. In fact, it seems that sometimes our politicians don’t even listen to themselves. The following is a true story: At a national (14) conference held in Albuquerque some years ago, then Senator Joseph Montoya was (15) a copy of a press release by a press aide shortly before he got up before the audience to (16) a speech. When he rose to speak, (17) the horror of the press aide and the (18) of his audience, Montoya began reading the press release, not his speech. He began, "For immediate release. Senator Joseph M. Montoya, Democrat of New Mexico, last night told the National... " Montoya read the entire six page release, (19) with the statement that he "was repeatedly (20) by applause.

9（）

A.relates

B.refers

C.responds

D.resorts

下面不属于改变泵与风机性能曲线的方法的是（）。

A.变速调节；

B.出口节流调节；

C.动叶调节；

D.汽蚀调节。