在△ABC中，∠A，∠B．∠C的对边分别为a，b，c，已知
　　（1）求的值；
　　（2）求b的值．

[单选题]Good Table Manners Manners play an important part in making a favorable impression at the dinner table. Here are some general rules： Napkin （餐巾） use The meal begins when the host unfolds his or her napkin. This is your signal to do the same， so place your napkin on your lap. Unfold it completely if it is a small napkin. Or in half， lengthwise （纵向地） ，if it is a large dinner napkin. If you need to leave the table during the meal， place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over， place your napkin neatly on the table to the right of your dinner plate. Do not refold it. Use a napkin only for your mouth. Never use it for your nose， face or forehead. Use of utensils （餐具） Start with the knife， fork or spoon furthest from your plate， and work your way in， using one utensil for each course. If soup is served， remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead， fill a soup spoon about 75 per cent with soup， and sip（啜饮）it from the side noiselessly. After finishing dinner， place the knife and fork parallel to one another across the plate with the knife blade facing inward toward the plate. Using your fingers Here's a list of finger foods： sandwiches， cookies， small fruits or berries with stems， French fries and potato chips， and hamburgers. Chew（咀嚼）with your mouth closed and don't make noise； don't talk with your mouth full. Bread must be broken with your hands. It is never cut with a knife. Don't pick something Out of your teeth. Instead， excuse yourself to the bathroom. If possible， try not to cough at the table. Do not put your elbows （肘） on the table. In France， it is essential to have both hands above the table at the same time. Do not put bones or anything else on the table. Things that are not eaten should be put on your plate. The napkin is used only for（）.

[多选题]对证券公司期货交易介绍业务实行管理的机构是（）。

[问答题]简述自动化血培养检测和分析系统常见故障及维护。

[单选题]我国普通轨枕的长度为（）

[名词解释题]珩齿

[单选题]患者，女，26岁。有“狂病”史。现常无名恐惧，胡乱猜疑，睡眠很少，面色晦暗，言语不清，头痛头晕，舌暗红有瘀斑，苔薄黄，脉细涩。现治疗选方宜（）

[判断题]上门收款人员必须在营业时间内返回营业机构，对于因特殊情况或突发事件无法及时返回的，上门收款人员必须妥善安排尾箱押运事宜，确保当日日终前入库，并于次日立即完成后续工作。

[单选题]颜色在一种光线下匹配，而在另一种光线下不匹配，这种现象叫做（）。

[多选题]合理的隧道开挖方案，应满足的要求有（）

[多选题]无线资源管理（RRM）的目的是什么？（）