搜题请搜索小程序“爱下问搜题”
问题 选择题

同学们在做实验时发现，将镁条放入某CuCl2溶液中，镁条表面有气泡产生。对于这一异常现象产生的原因，同学们设计了以下探究方案进行讨论。其中没有意 义的是          [ ]

A.甲同学推测该气体可能是H2 ,并收集气体用点燃法检验。      

B.乙同学猜想该CuCl2溶液呈酸性，并用pH试纸检测。      

C.丙同学用锌粒与该CuCl2溶液反应，观察是否有气泡产生。   

D.丁同学用镁粉与该CuCl2溶液反应，观察产生气泡的快慢

答案

答案：D

单项选择题

七氟烷对机体的影响有

A．舒张脑血管，降低颅内压

B．增强心肌收缩力，降低外周阻力

C．1．5MAC以下时可以扩张冠脉

D．对呼吸道有刺激作用，增加呼吸道分泌物

E．增强非去极化肌松药的作用
查看答案
单项选择题

The nobler and more perfect a thing is, the later and slower it is becoming mature. A man reaches the mature (1) of his reasoning powers and mental faculties (2) before the age of twenty-eight; a woman at eighteen. And then, too, in the case of woman, it is the only reason of a sort--very mean in its (3) . That is why women remain children their whole life long; never seeing (4) but what is quite close to them, (5) fast to the present moment, taking appearance for (6) , and preferring (7) to matters of the first importance. For it is (8) his reasoning faculty that man does not live in the present only, (9) the brute, but looks about him and considers the past and the future; and this is the origin of (10) , as well as that of care and anxiety which so many people (11) Both the advantages and the disadvantages, which this (12) , are (13) in by the woman to a smaller extent because of her weaker power of reasoning. She may, in fact, be described as intellectually shortsighted, (14) , while she has an immediate understanding of what lies quite close to her, her field of (15) is narrow and does not reach to what is (16) ; so that things which are absent, or past, or to come, have much less effect upon women than upon men. This is the reason why women are inclined to be (17) and sometimes carry their desire to a (18) that borders upon madness. In their hearts, women think it is men’s business to earn money and theirs to spend it--if possible during their husband’s life, (19) , at any rate, after his death. The very fact that their husband hands them (20) his earnings for purposes of housekeeping strengthens them in this belief.

6（）

A.fancy

B.practice

C.reality

D.illusion
查看答案