治疗湿热黄疸，应选用的药物是（） A.车前子 B.金钱草 C.木通 D.

关于离心泵轴承的以下说法中错误的是（）。

A．轴承安装前可加热至150℃左右再装入轴上

B．轴承外圈与安装处通常为过盈配合

C．立式泵若有两只止推轴承通常“背靠背”安装

D．水润滑轴承功率损失小，但承载能力低

流行病学实验研究的人群来自（）

A.同一总体的患某病的患者

B.同一总体的健康人

C.同一总体的暴露人群和非暴露人群

D.同一总体的干预人群和非干预人群

E.同一总体的病例人群和非病例人群

Pharming is a scamming practice in which malicious code is installed on a personal computer or server,misdirecting users to ______ Web sites without their knowledge or consent. Pharming has been called "phishingwithout a lure".
In phishing, the perpetrator sends out legitimate-______ e-mails, appearing to come from some of theWeb’s most popular sites, in an effort to obtain personal and financial information from individualrecipients. But in pharming, larger numbers of computer users can be ______ because it is not necessaryto target individuals one by one and no conscious action is required on the part of the victim. In one form ofpharming attack, code sent in an e-mail modifies local host files on a personal computer. The host filesconvert URLs into the number strings that the computer uses to access Web sites. A computer with acompromised host file will go to the fake Web site even if a user types in the correct Internet address orclicks on an affected ______ entry. Some spyware removal programs can correct the corruption, but itfrequently recurs unless the user changes browsing ______

A. hypertext B. computationC. expectationD. bookmark

门捷列夫在描述元素周期表时，许多元素尚未发现，但他为第四周期的三种元素留下了空位，并对它们的一些性质作了预测，X是其中的一种“类硅”元素，后来被德国化学家文克勒发现，并证实门捷列夫当时的预测相当准确。根据元素周期律，下列有关X性质的描述中错误的是______

A．X单质不易与水反应

B．XO₂可被碳或氢还原为X

C．XCl₄的沸点比SiCl₄的高

D．XH₄的稳定性比SiH₄的高

既能祛风解表，炒炭又可止血的药物是（）

A.羌活

B.白芷

C.桂枝

D.荆芥

E.苍耳子