旋翼式水表使用（）。 A.直板形 B.螺板形 C.折板形 D.斜板形

（20分）(1) 25℃时，在酸性、碱性、中性溶液中，C(H⁺)·C(OH^-)＝                 。

某温度下纯水中的C（H⁺）= 2×10^-7mol/L，则此时溶液中的C（OH^-）=        mol/L；若温度不变，滴入稀盐酸，使c（H⁺）= 5×10^-4mol/L，则溶液中C（OH^-）=         mol/L，pH=          .

(2) 室温下取0.2 mol·L^－1HCl溶液与0.2 mol·L^－1 MOH溶液等体积混合(忽略混合后溶液体积的变化)，测得混合溶液的pH＝6，试回答以下问题：

① 混合溶液中水电离出的c(H⁺)________0.2mol·L^－1 HCl溶液中水电离出的c(H⁺)；(填“＞”、“＜”、或“＝”)

② 求出混合溶液中下列算式的精确计算结果(填具体数字)：

c(Cl^－)－c(M⁺)＝__________ mol·L^－1   c(H⁺)－c(MOH) ＝__________ mol·L^－1

(3) 室温下如果取0.2 mol·L^－1 MOH溶液与0.1 mol·L^－1 HCl溶液等体积混合，测得混合溶液的pH＜7，则说明MOH的电离程度________MCl的水解程度。(填“＞”、“＜”、或“＝”)，溶液中各离子浓度由大到小的顺序为_______________________。

(4)室温下，pH=13的强碱溶液与pH=2的强酸溶液混合，所得溶液的pH=7，则强碱与强酸的体积比是    

It was a fixing sight: there, in the Capitol itself, a U.S. Senator often mocked for his halting, inarticulate speaking, reached deep into his Midwestern roots and spoke eloquently, even poetically, about who he was and what he believed, stunning politicians and journalists alike.

I refer, of course, to Senator Jefferson Smith. In Frank Capra’s classic Mr. Smith Goes to Washington, Jimmy Stewart plays this simple, idealistic small-town American, mocked and scorned by the big-moneyed, oh-so-sophisticated power elite--only to triumph over a corrupt Establishment with his rock-solid goodness.

At root, it is this role that soon-to-be-ex-Senator Bob Dole most aspires to play: the self effacing, quietly powerful small-town man from Main Street who outwits the cosmopolitan, slick-talking snob from the fleshpots. And why not There is, after all, no more enduring American icon.

How enduring Before Americans had a Constitution, Thomas Jefferson was arguing that the new nation’s future would depend on a base of agrarian yeomen free from the vices inherent in big cities. In 1840 one of the classic, image-driven presidential campaigns featured William Henry Harrison as the embodiment of rural virtues, the candidate of the log cabin and hard cider, defeating the incumbent Martin Van Buren, who was accused of dandified dress and manners.

There is, of course, a huge disconnect between this professed love of the simple, unspoiled life and the way Americans actually live. As a people, Americans have spent the better part of the 20th century deserting the farms and the small towns for the cities and the suburbs; and are torn between vacationing in Disney World and Las Vegas.

U.S. politicians too haven’t exactly shunned the temptations of the cosmopolitan life. The town of Russell, Kansas, often seems to be Dole’s running mate, but the candidate spends his leisure time in a luxury condominium in Bal Harbor, Florida. Bill Clinton still believes in a place called Hope, but the spiffy, celebrity-dense resorts of Martha’s Vineyard and Jackson Hole are where he kicks back. Ronald Reagan embodied the faith-and-family pieties of the front porch and Main Street, but he fled Iowa for a career and a life in Hollywood.

Still, the hunger for the way Americans believe they are supposed to live is p, and the distrust of the intellectual hustler with his airs and his high-flown language runs deep. It makes sense for the Dole campaign to make this a contest between Dole as the laconic, quiet man whose words can be trusted and Bill Clinton as the traveling salesman with a line of smooth patter but a suitcase full of damaged goods. It makes sense for Dole to make his campaign song Thank God I’m a Country Boy--even if he is humming it 9,200 m up in a corporate jet on his way to a Florida condo.

It seems that the author is most critical of some politicians’（）

A. hypocrisy

B. elegance

C. prestige

D. absurdity

代谢高涨期下列哪项变化正确（）

A.代谢率减少

B.体温下降

C.心排血量减少

D.血浆儿茶酚胺水平增加

E.正氨平衡

小麦的小穗是一个穗状花序。

对需要经常移动传感器、电缆等，须由（）负责按规定移动。

A、瓦斯检查员

B、安全监测工

C、采掘班组长