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【单选题】
Valentine's Day is a festival of romance and affection. The holiday is an interesting combination of pagan (异教徒的) and Christian influences. Some of the day's customs probably came from an ancient Roman holiday caned Lupercalia, Which honored Juno (wife of Jupiter, the goddess of women, marriage, and childbirth) and Pan (the God of nature). During the Lupercalia festival, young women dropped poems bearing their names into a large vase. Each young man picked a name from the vase to find his sweetheart for that year. During the Middle Ages, church leaders wanted to relate this pagan holiday to Christianity, so they renamed it after a Christian saint and moved the holiday from February 15 to February 14, the feast day of St. Valentine. St. Valentine was a third-century Christian martyr, a young man who was imprisoned in Rome for refusing to worship pagan gods. According to legend, before Valentine was beheaded on February 14, he restored the eyesight of his jailer's blind daughter. Then he sent her a farewell letter signed, 'From your Valentine'. This phrase is now a common expression of affection that appears on many of the holiday greeting cards. Perhaps another reason that February 14 was picked as a holiday for lovers was that the ancient Romans believed that birds began to mate on this date. In modern times, early in February of each year, card shops, drugstores, and department stores begin displaying a wide variety of greeting cards called valentines. Most of them are illustrated with the symbolic red heart, which stands for love. Many also show a picture of Cupid with his bow and arrow. Some valentines are very fancy--decorated with paper lace, scented satin, feathers, ribbons, or bows. Some contain affectionate verses, while others simply say, 'Be my Valentine'. There are special Valentines for various family members, sweet hearts, and friends. People sometimes send anonymous valentines to the persons whom they are in secret love with. On that day, children usually buy packages of small, inexpensive valentines to give to classmates and teachers. Sweet-hearts and married couples may exchange more expensive cards, along with small gifts. Men often give red roses or chocolates wrapped up beautifully in red, heart-shaped boxes to their girlfriends or wives. The best title for this passage is ______
A.
The Origin of Valentine's Day
B.
Valentine's Day Celebration
C.
Valentine, a Love Festival
D.
Be My Valentine
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【单选题】左心功能不全时常见症状为呼吸困难
A.
胸水
B.
肝脾肿大
C.
下肢浮肿
D.
腹水
E.
呼吸困难
【单选题】左心功能不全时常见症状为
A.
胸水
B.
肝脾肿大
C.
下肢浮肿
D.
腹水
E.
呼吸困难
【单选题】下列对锂离子电池描述错误的是:
A.
锂离子电池一般由正极、负极、隔膜材料、电解液和电池外壳组成
B.
锂离子电池正极常用的活性物质有钴酸锂、锰酸锂等材料
C.
锂离子电池中的电解质常采用锂盐
D.
锂离子电池中的隔膜材料不能让离子通过
【多选题】患儿女,20d。其母为妊娠高血压综合征、妊娠糖尿病。于孕36周行剖宫产。患儿自生后第3天起反复出皮疹,出新皮疹时伴发热,体温波动在38℃左右,无嗜睡、呼吸急促、呕吐及腹泻等症状。入院查体:全身散在红色斑丘疹,高出表皮似风团,圆形或不规则形,疹间可见正常皮肤,以臀部及双下肢为重,无黏膜损害。心、肺、腹部查体未见异常。鉴于上述症状,患儿应做的检查项目是()
A.
血常规检测
B.
肝功能检测
C.
肾功能检测
D.
血电解质测定
E.
TORCH4项检测
F.
血培养
G.
脑脊液常规测定
【多选题】锂离子电池应用越来越广泛,主要原因有()
A.
锂离子电池为清洁能源,无污染
B.
能量密度高
C.
充电效率高
D.
价格高
【单选题】电动车电池是一种锂离子电池.根据锂离子电池所用电解质材料不同,锂离子电池可分为液态锂离子电池(简称为LIB)和聚合物锂离子电池(简称为LIP)两大类.聚合物锂离子电池总反应:LiCoO 2 +6C 充电 放电 Li 1-x CoO 2 +Li x C 6 ,以下说法不正确的是(  )
A.
充电时,阴极反应(还原反应):6C+xLi + +xe - ═Li x C 6
B.
放电时,正极反应(还原反应)Li 1-x CoO 2 +xLi + +xe - ═LiCoO 2
C.
充电时,电池的负极与电源的负极相连
D.
放电时,Li + 向负极移动
【多选题】锂离子电池常用的有下列哪几种?
A.
三元锂离子电池
B.
钴酸锂
C.
锰酸锂
D.
铅酸锂
【简答题】何为锂离子电池?锂离子电池有何优缺点?
【判断题】云存储是指通过集群应用、网络技术或分布式文件系统等功能 , 将网络中大量各种不同类型的存储设备通过应用软件集合起来协同工作 , 共同对外提供数据存储和业务访问功能的一个系统。
A.
正确
B.
错误
【多选题】根据锂离子电池所用电解质材料不同,锂离子电池可以分为()两大类。
A.
二次电池
B.
液态锂离子电池
C.
固态电池
D.
聚合物锂离子电池
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