电疗法基础知识中，“电流的方向与强度不断地随时间而发生变化的电流”属于（）

[问答题]Practice 3　　A newspaper is much more than a business; it is an institution. It reflects and influences the life of a community; it may affect even wider destinies.　　It is, in its way, an instrument of government. It plays on the minds and consciences of man. It may educate, stimulate, assist, or it may do the opposite. It has, therefore, a moral as well as a material existence, and its character and influence are in the main determined by the balance of these two factors. It may make profit or power its first object, or it may conceive itself as fulfilling a higher and more exacting function.　　Character is a subtle affaire, and has many shades and sides. It is not a thing to be much talked about, but rather to be felt. It is the slow deposit of past actions and ideas.　　At the perils of its soul, a newspaper must see that the news it supplies is not tainted. Neither in what it gives, nor in what it does not give, nor in the mode of presentation, must the unclouded face of truth suffer wrong. Comment is free, but facts are sacred. “Propaganda,” so called, by this means is hateful. The voice of opponents no less than that of friends has a right to be heard. Comment also is justly subject to a self-imposed restraint. It is well to be frank; it is even better to be fair. This is an ideal. Achievement in such matters is hardly given to man. Perhaps none of us can attain to it in the desirable measure. We can but try, ask pardon for shortcomings, and there leave the matter.　　One of the virtues, perhaps the chief virtue, of a newspaper is its independence. Whatever its position or character, it should have a soul of its own.　　That is the path of self-respect—it is also the path of success. And what a work it is! How multiform, how responsive to every need—and every incident of life! What illimitable possibilities of achievement and of excellence!　　To the man, whatever his place on the paper, nothing should satisfy short of the best. It is here that ability counts and that character counts, and it is on these that a newspaper, if it is to be worthy of its power and duty, must rely.

[多选题]天坛位于北京，始建于（　　）。

[单选题]经呼吸道动式染毒的主要缺点是（）。

[单选题]患儿，7岁。发热轻微，鼻塞流涕，喷嚏，咳嗽，起病第2天出皮疹，疹色红润，疱浆清亮，根盘红晕；皮疹瘙痒，分布稀疏，此起彼伏，以躯干为多。舌苔薄白，脉浮数。其治法是（　　）。

[多选题]公司、局、总公司的科技进步奖包括（）

[单选题]在保存网页的时候，以下文件类型中不可能被保存的是（） ①mp3；②avi；③gif；④jpg；⑤swf。

[单选题]保险公司在选择目标市场的过程中，可以运用无差异营销、差异性营销和集中性营销三种方式，其中集中性营销策略的优点是（）。

[单选题]一女性患者因胫骨上端骨肿瘤行胫骨上端骨切除术后拟行膝关节置换治疗，选择哪种假体为好（）

[判断题]装有电液转辙机的分动外锁闭装置，在道岔开口符合要求时限位块与锁闭框间隙不大于3mm。

[单选题]甾体激素类药物与强酸的呈色反应机制是基于（）