It was not "the comet of the century"
experts predicted it might be. However, Kohoutek has provided a bonanza of
scientific information. It was first spotted 370 million miles from Earth, by an
astronomer who was searching the sky for asteroids, and after whom the comet was
named. Scientists who tracked Kohoutek the ten months before it passed the Earth
predicted the comet would be a brilliant spectacle. But Kohoutek fell short of
these predictions, disappointing millions of amateur sky watchers, when it
proved too pale to be seen with the unaided eye. Researchers were very happy
nonetheless with the new information they were able to glean from their
investigation of file comet. Perhaps the most significant discovery was the
identification of two important chemical compounds -- methyl cyanide and
hydrogen cyanide -- never before A. Where were comets formed B. When were comets formed C. Where was the solar system formed D. How was the solar system formed [多项选择]绝经后骨质疏松症的风险因素包括()
A. 低体重 B. 吸烟 C. 骨折家族史 D. 性激素缺乏 E. 消化性溃疡 [多选题]《建设工程安全生产管理条例》规定,勘察单位在勘察作业时,应当严格执行操作规程,采取措施保证各类( )的安全。
A.管线 B.材料 C.设施 D.周边建筑物、构筑物 [单项选择]在运行中的水池内工作时,()循环水泵的()口。禁止进入运行中的水沟内工作。
A. 可以靠近;出口管 B. 禁止靠近;进水管 C. 可以靠近;进水管 [判断题]海关检查进出境运输工具时,运输工具负责人应当到场,并根据海关的要求开启舱室、房间、车门;有走私嫌疑的,还应当开拆可能藏匿走私货物、物品的部位,搬移货物、物料等。 ( )
[单选题]男,32岁。发热3天,晕 厥1次,心电图显示第三度房室传导阻滞,心室率40次/分,下列说法中错误的是
A.心房和心室活动各自独立,互不相关 B.心房率快于心室率 C.心室起搏点通常在阻滞部位稍下方 D.心房冲动来自窦房结或心房异位节律 E.心室率不能低于40次/分 [判断题]登杆作业前应检查电杆的各部位强度和质量,电杆未回填夯实前不得登杆作业。( )
A.正确 B.错误 [多选题]属于使用劳动防护用品的一般要求的是()。
A.防护用品应定期进行维护保养 B.使用前应首先做一次外观检查 C.劳动用品的使用必须在其性能范围内,不得超极限使用 D.严格按照《使用说明书》正确使用劳动防护用品 [单选题]党的 19 大报告指出,全面深化改革总目标是()。
A.实现社会主义现代化 B.实现中国梦 C.全面建立社会主义市场经济体制 D.完善和发展中国特色社会主义制度、推进国家治理体系和治理能力现代化 [判断题]应急救援队伍根据救援命令参加生产安全事故应急救援所耗费用,由事故责任人承担。( )
A.正确 B.错误 [单项选择]单元格的引用,不包括()。
A. 相对引用 B. 绝对引用 C. 混合引用 D. 直接引用 我来回答: 提交
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