艺术设计的特征包括（）A.被动性和主动性 B.创意性和图形性 C.产品性和科学性 D

从手中竖直向上抛出的小球，与水平天花板碰撞后又落回到手中，设竖直向上的方向为正方向，小球与天花板碰撞时间极短．若不计空气阻力和碰撞后以原来速率反弹，则下列图像中能够描述小球从抛出到落回手中整个过程中速度v随时间t变化的关系图象是：

氯化铁是常见的水处理剂，无水FeCl₃的熔点为555K、沸点为588K。工业上制备无水FeCl₃的一种工艺如下：

无水FeCl₃的一种工艺如下：

（1）取0.5mL三氯化铁溶液滴入50mL沸水中，再煮沸片刻得红褐色透明液体，该过程可用离子方程式表示为：________________________ 。

（2）已知六水合氯化铁在水中的溶解度如下：

从FeCl₃溶液中获得FeCl₃·6H₂O的方法是：_________________ 。

（3）捕集器中温度超过673K，存在相对分子质量为325的物质，该物质的分子式为：___________

（4）室温时在FeCl₃溶液中滴加NaOH溶液，当溶液pH为2.7时，Fe³⁺开始沉淀；当溶液pH为4时，c(Fe³⁺)= ______________mol/L（已知：Ksp[Fe(OH)₃]= 1.1×10^－36）。

（5）吸收剂X是: ____________；吸收塔中吸收剂X的作用是：_____________________ 。

（6）FeCl₃的质量分数通常可用碘量法测定：称取m克无水氯化铁样品，溶于稀盐酸，再转移到100mL容量瓶，用蒸馏水定容；取出10mL，加入稍过量的KI溶液，充分反应后，用淀粉作指示剂并用cmol/LNa₂S₂O₃溶液滴定，反应方程式为：I₂+2S₂O₃^2－=2I^－+S₄O₆^2－，共用去VmL。则样品中氯化铁的质量分数为：______________。

对于局灶性发作，符合发作期脑电图表现的是（）。

A.局灶起源的癫痫异常放电很难向对侧半球扩散

B.发作起始后传播到其他部位的频率、波幅、波形等可能不一致

C.发作期间节律最强的脑区往往与发作症状无相关性

D.头皮脑电图发作起源多出现在发作间期异常放电的脑区

E.头皮发作期脑电图是癫痫发作传导的结果，对定位意义不大

谈话法能激发小学生思维的积极性，引起小学生的认识兴趣，所以小学各科教学中都要用谈话法进行教学。( )

I don’t know if there’s something in the water, but my town has exploded with tons of single people! Just last year, practically the only eligibles I knew were my divorced friend Patti, my bud Fulgencio, hubby Rick’s barfly pat Craig, and Jimmy the pizza delivery guy. But now, I find-out that my cousin Michelle is leaving her second husband, and a recent chit-chat with my building’s manager Sandy revealed that she hasn’t had a serious relationship in almost five years! Besides that, at least five suspected singletons have moved into my building since June. Five!

For an incurable romantic like me, this is heartbreaking. People are meant to have sweeties! I feel so sorry for single people. How can they bear going through life alone I know a lot of them put up. that "independent" front, or use that "I’m just waiting for the right person" defense, but they’re kidding themselves. Why would anyone turn up her nose at the prospect of a beautiful wedding, a gorgeous bridal gown, and a stunning rock on her finger She wouldn’t. Why would anyone shake a stick at a warm dinner every night, a comfortable home, and a beautiful bride It just isn’t rational. And I don’t like to be harsh, but frankly, it’s depressing to see singles out in public. When I see a girl shopping for groceries by herself, or a solitary guy reading while he waits for a bus, I can’t help but sense the hollowness that single person feels inside. I’m partially psychic, so I’m aware of other people’s inner feelings.

Well, this Valentine’s Day, I’m not going to be selfish. People like me, people in successful, lasting relationships, are duty-bound to share their romantic wisdom with the less fortunate. Granted, it’s been a while since I’ve been on the dating Scene, so my chops are a bit rusty. In fact, hubby Rick is just about the only guy I’ve ever dated (Unless you count my pick for the Sadie Hawkins dance in seventh grade, Jordy DeVoe, who ditched me after about 15 minutes. Or this Oriental kid named Thant who wrapped love notes around lunchroom cookies and slipped them into my locker in ninth grade.) But Rick and I have been married nearly 20 years, so I must be doing something right. Dry those tears, Singletons! Pull your-selves together and listen to Wifey Jean. If you follow my advice, I’ll bet you dollars to donuts that you’ll find your Prince Charming, or Princess Enchanting, in no time!

Why does the author want to share her "romantic wisdom" with the singletons（）

A. She wants to give it to the singletons as a Valentine Gift

B. She thinks it is her responsibility to help them

C. She feels that she has been very selfish before

D. She wants to revive her feelings of dating a long time ago