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问题 不定项选择题

在25℃时，密闭容器中X、Y、Z三种气体的初始浓度和平衡浓度如下表

下列说法错误的是[ ]

A．反应达到平衡时，X的转化率为50％

B．反应可表示为X+3Y2Z，其平衡常数为1600

C．增大压强使平衡向生成Z的方向移动，平衡常数增大

D．改变压强可以改变此反应的平衡常数

答案

CD

单项选择题

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. \

20（）

A.disrupted

B.interfered

C.interrupted

D.stopped
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单项选择题

设f(x)在x=0处满足f’(0)=f"(0)=…=f(n)(0)=0，f(n+1)(0)＞0，则（）。

A．当n为偶数时，x=0是f(x)的极大值点

B．当n为偶数时，x=0是f(x)的极小值点

C．当n为奇数时，x=0是f(x)的极大值点

D．当n为奇数时，x=0是f(x)的极小值点
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