茶碱静脉注射过快可引起A．呼吸抑制 B．心律失常 C．惊厥 D．血压骤降 E．支气管

根据《公司法》，下列关于一人有限责任公司的说法中，正确的是( )。

A．一人有限责任公司的股东仅限于一个自然人

B．一个自然人只能投资设立一个一人有限责任公司

C．一人有限责任公司的股东可以分次缴纳公司章程规定的出资额：但首次缴纳不能低于规定出资额的20％

D．一人有限责任公司的注册资本最低限额为人民币3万元

光滑平面上一运动质点以速度v通过原点O，v与x轴正方向成α角（如图所示），与此同时对质点加上沿x轴正方向的恒力F_x和沿y轴正方向的恒力F_y，则（　　）

A．因为有F_x，质点一定做曲线运动

B．如果F_y＞F_x，质点向y轴一侧做曲线运动

C．质点不可能做直线运动

D．如果F_x＞F_ycotα，质点向x轴一侧做曲线运动

25℃，101 kPa时，强酸与强碱的稀溶液发生中和反应的中和热为57.3 kJ/mol，辛烷的燃烧热为5518

kJ/mol。下列热化学方程式书写正确的是[ ]

A. 2H⁺(aq)+SO₄^2-(aq)+Ba²⁺(aq)+2OH^-(aq)=BaSO₄(s)+2H₂O(l) △H=-57.3 kJ/mol

B. KOH(aq)+1/2H₂SO₄(aq)=1/2K₂SO₄(aq)+H₂O(l) △H=-57. 3 kJ/mol

C. C₈H₁₈(l)+25/2O₂(g)=8CO₂(g)+9H₂O( g) △H=-5518kJ/mol

D. 2C₈H₁₈(g)+25O₂(g)=16CO₂(g)+18H₂O(l) △H=-5 518 kJ/mol

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

A. displaying B. illustrating C. drawingD. writing

A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical files. Display text, display graphics, and (73) hyperlinks ——there’s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all - out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client -side Java applets were supposed to become the preferred (75) , for application development Remember frames and all their nasty side effects

什么叫喂丝？喂丝注意事项有哪些？