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The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge {{U}} (51) {{/U}} the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid {{U}} (52) {{/U}} milk came out, and that {{U}} (53) {{/U}} this a sticky (粘的) mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any {{U}} (54) {{/U}}. The Peruvians made the {{U}} (55) {{/U}} that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to {{U}} (56) {{/U}} their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cl A. for B. to C. about D. with [多选题]. 网络软件系统包括
A.信息管理系统 B.数据库管理系统 C.网络通信协议 D.网络操作系统 [填空题]中央委员会委员和候补委员的名额,由_()___决定。
[单选题]电力监控系统的( )及其权限应及时注销或调整。
A. A．过期帐号 [判断题]配备消防员优先保障基层单位机关及勤务保障单位因工作原因临时借用消防员必须严格控制，由支队以上单位正职领导审批，借用时间一般不超过30日。
A.正确 B.错误 [单项选择]Decentralization is best defined as ______.
A. movement from the central city to rural areas B. movement from the central city to the suburbs C. disorderly expansion of the central city D. shrinking of metropolitan [多项选择]机械式手表表芯中的孔可用( )加工。
A. 摇臂钻床 B. 立式钻床 C. 激光 D. 超声波 E. 卧式镗床 [判断题]营销作业人员在现场工作过程中，凡遇到异常情况（如因二次回路短路、开路等情况引起相关设备误动作）,不论与本身工作是否有关，应立即停止工作，保持现状，待处理完毕，确定与本工作无关时方可继续工作。
A.正确 B.错误 [单项选择]权利人申请变更登记，应当自变更事实发生之日起( )日内提出申请，并提交房屋权属证书以及相关的证明文件。
A. 10 B. 30 C. 60 D. 90 [单项选择]签字仪式结束后的工作有（）、按电梯、送别客人、检查有无客人遗留物品。
A. 为宾客开门 B. 收拾物品 C. 清洁卫生 D. 准备其他工作 [单选题]中国特色社会主义事业总体布局是( )。
A.“五位一体” B.“四个全面” C.“四个自信” D.两步走战略 我来回答: 提交
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