2010年4月24—28日,第二十届全国图书交易博览会在四川省成都市举行,
举办此次图书交易博览会有利于( )
①繁荣当地文化市场; ②世界的和平与发展;
③提升当地的文化软实力; ④推动当地经济发展;
A.①②③
B.①③④
C.②③④
D.①②④
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It was a cold winter evening. 1 old man had done his work and was going home from the fields. 2 his way he saw something on the ground. He looked at it and 3 it was a snake (蛇). It was not 4 , but it couldn't move because it was so cold. "Poor thing," the man said, "I must try to save your life." He picked 5 and looked for a warm place to put it in. But how could he find one in 6 cold weather? So he decided 7 the snake inside his clothes, right next to his heart. 8 minutes later, the snake came back to life and began to move. 9 it had become 10 , it gave the man a bite (咬). He killed (杀死) it and went on. When he got back, he was very ill and had to lie down. | ||||
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为了测定某氯酸钾与二氧化锰混合物中氯酸钾的质量分数,课外小组的同学设计了如下实验:取3.0g混合样品放入如图所示的大试管中,充分加热,直到反应完全,并用如图所示装置测量出生成氧气的体积.试回答下列问题:
(1)如何检查装置的气密性?
______.
(2)现有如下可供选择的操作:①将导气管放入盛满水的量筒内;②给药品加热;③有连续气泡产生时开始收集气体;④取出导气管;⑤反应完全后停止加热(如图,此时导管出口略高于液面);⑥冷却至室温;⑦调整量筒内外液面高度使之相同后读出量筒内气体体积数.
为了较准确地测量出生成的氧气在常温、常压下的体积,正确的操作顺序是______.
(3)为了较准确地测量到气体的体积,需要调整量筒内外液面高度,其原理是______.
(4)在常温常压下共收集到气体680mL(此时氧气密度为1.41g•L-1),其质量为______g,原混合物中氯酸钾的质量分数约是______.
(116~118题共用题干)女性,50岁,腹部阵发性胀痛1天,呕吐为胃内容物,近3个月来有时腹胀,大便带黏液无脓血。查体:BP17/12kPa(128/90mmHg),P86次/分,腹胀,未见肠型,右下腹触及一斜行肿块,质韧压痛,腹部透视见一个气液平面,白细胞11×109/L,血红蛋白87g/L。
下列检查意义最大的是
A.腹部B超
B.纤维结肠镜
C.X线钡餐透视
D.腹部
如图所示,将一个体积为1.0×10-3m3、重6N的木块用细线系在底面积为400cm2的圆柱形容器的底部.当容器中倒入足够的水使木块被浸没时,求:(g=10N/kg)
(1)木块浸没在水中受到的浮力;
(2)剪断细线后,木块处于静止时,木块露出水面的体积多大;
(3)木块露出水面处于静止后,容器底部所受水的压强减小了多少.
深圳皇岗区的一加工企业与国外某公司签订一份来料加工合同,由外方提供价值60万美元的原料。该批货物属于非法检货物,成交方式为CIF广州,外商在本国投保了一切险。国外的生产厂家把该批货物装入集装箱,货物运至深圳皇岗口岸,收货人与检验人员验货时发现有一部分货物变质,失去了使用价值。据分析,是商品本身的内在质量缺陷造成的,运输完全属于正常运输。货物运到该加工企业后,该企业把剩余完好的原料加工成品后返销国外某公司。
根据以上所述,选出下列问题中的正确答案。
下列______是该批货物进口时需向海关递交的单证。
A.发票、提单、装箱单
B.加工贸易手册
C.进口货物报关单
D.入境货物通关单