回转装置的作用及组成?
参考答案:
回转装置用来支承变幅机构和实现堆取料时前臂架的回转运动,由回转支承和回转传动两大部分组成。
One day a girl gets a package in the mail. It contains US$3,000___31__cash and a letter from ‑her late (去世的) Aunt Peg. Aunt Peg has something useful to pass __32___to her niece, but a rather unusual way of going about it. The girl __33___ (give) a set of instructions: "Go to an address in New York and pick up a package, get a passport and buy yourself a one-way ticket to London." ___34___ she flies she is told to make sure she only takes ___35___she can fit into a backpack. No money, credit cards, camera. No mobile phone ___36____ laptop. And once she gets to Europe she can't call or even e-mail home. On the plane, Ginny opens the New York package. It sends her to a flat in London where a man___37__ (name) Richard seems to be expecting her.
This is __38____ US author Maureen Johnson's hit teen novel, "13 Little Blue Envelopes" opens. ___39____ heroine (女主人公) is Ginny, a quiet, 17-year-old girl , __40___ has a great adventure ahead of her.
7个月男婴,发热咳嗽5天,近2天来呕吐,每天4次,今天突然抽搐3次,曾注青霉素3天,生后已种卡介苗,以往无抽搐史,否认头部创伤史。查体:嗜睡状,呼吸稍促,前囟饱满,颈无抵抗,两肺少许中小湿啰音,巴氏征(+),克、布氏征(﹣)。实验室检查:PPD试验0.8cm×0.9cm;血常规:白细胞17×109/L,N66%,L34%;脑脊液:外观微混,白细胞800×106/L,N80%,L20%,蛋白质2000mg/L,氯化物105mmol/L,糖2.3mmol/L。涂片未见细菌。
应首选哪组抗生素治疗()
A.青霉素+氨苄西林
B.复方新诺明
C.异烟肼+链霉素
D.庆大霉素+氯霉素
E.庆大霉素+苯唑西林