高速公路行驶时速100km/n时，车辆间距应保持在多少米以上？

已知A—O分别代表一种物质，它们之间的转化关系如下图所示（反应条件略）。A、B、H分别是由短周期元素组成的单质。B与冷水缓慢反应，与沸水迅速反应，放出氢气。D是一种离子化合物，其阴阳离子的个数比为2：3，且能与水反就应得到两种碱。C为淡黄色固体化合物，O能与G的水溶液反应生成蓝色沉淀。请回答下列问题：

⑴组成B单质的元素位于周期表位置________________。化合物C电子式为____________。

⑵J的沸点比硒化氢（H₂Se）的熔沸点高，其原因是_________________。

⑶I与H在一定条件下也可直接反应生成L和J, 写出化学方程式：_______________。

⑷写出D与水反应的化学方程式：_____________________。

⑸红棕色污染气体M的处理具有实际意义。现在常利用反应

M ＋ NH₃N₂＋H₂O（方程没配平）来处理M。当转移0.4mol电子时，消耗的M在标准状况下是       L。

#include＜stdio．h＞

long fun(int n)

{

long s；

if(n＜=2)s=2；

else s=n+fun(n-1)；

printf("%d\t"，s)；

return s；

}

main()

{

fun(5)；

printf("\n")；

}

（）是我行根据商户客户业务经营活动的资金需求特点设计的，并为工银商友俱乐部会员专门提供的贷款服务。

A、商友通

B、商友富

C、商友贷

D、存贷通

有关骨粘合剂的应用，以下哪些叙述错误（）

A.骨粘合剂为高分子聚合物，由聚甲基丙烯酸甲酯粉剂和甲基丙烯酸甲酯单体构成

B.在将粉剂和液态单体混合的过程中，产热可高达100℃以上

C.单体具有挥发性，有刺激味，能吸收入血，为减少单体的吸收，应在混合时作充分的搅拌

D.骨粘合剂的血管扩张作用和可能产生的肺栓塞、低氧血症是造成心血管不良反应的主要原因

E.膝关节置换术中应用骨粘合剂时，捆扎止血带能减少不良反应的发生

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!

The examples of her cousin Michelle and the building’s manager are used to show（）

A. many people choose divorce to solve their emotional problems

B. women are not satisfied with their marriage

C. many people are not confident in serious relationships

D. more people are becoming loveless singles