未知题型 大量有机物积聚 (2)形成石油 (3)复杂的化学变化 (4)剧烈地质变化 (5)古浮游生物残骸沉积海底D.5―1―4―3―2
单项选择题 用于直接法制备标准溶液的试剂是( )。A、专用试剂B、基准试剂C、分析纯试剂D、化学纯试剂
不定项选择 昏时行礼，所以为“婚”。
单项选择题 某生产企业（增值税一般纳税人）2017年3月销售化工产品取得含税销售额793.26万元，为销售货物出借包装物，收取押金15.21万元，约定3个月内返还；当月没收逾期未退还包装物的押金1.3万元。该企业2017年3月上述业务的增值税计税销售额为（ ）万元。A. 679.11B. 691 C. 692.11 D. 794.56
多项选择题 危机爆发前的活动主要是预防和准备。应急预防的具体活动包括：
多项选择题 销售与应收系统必须有的初始设置为（ ） A、A、 收款期间设置 B、B、 结算方式设置 C、C、 客户档案设置 D、D、 存货档案设置
多项选择题 扶肋木挺髋练习动作要领和注意事项?A. 面朝前双手扶肋木蹲下,做向前挺髋练习B. 注意双手握的距离稍开,蹲下时放松,髋关节发力快,动作幅度大
未知题型 The advantage of 'drip' coffee makers shown in the text is that ______.A.they are much more economicB.they can produce only one cupC.they are more convenient and easier to operateD.they are more economical
未知题型 The word 'it' in Line 3, Para 3 probably refers to ______.A.the lidB.coffee -makerC.the brewing processD.the model
未知题型 In science the meaning of the word 'explain' suffers with civilization's every step in search of reality. Science cannot really explain electricity, magnetism, and gravitation; their effects can be measured and predicted, but of their nature no more is known to the modern scientist than to Thales who first looked into the nature of the electrification of amber, a hard yellowish-brown gum. Most contemporary physicists reject the notion that man can ever discover what these mysterious forces 'really' arE.Electricity, Bertrand Russell says, 'is not a thing, like St. Paul's Cathedral; it is a way in which things behavE.When we have told how things behave when they are electrified, and under what circumstances they are electrified, we have told all there is to tell.' Until recently scientists would have disapproved of such an ideA.Aristotle, for example, whose natural science dominated Western thought for two thousand years, believe that man could arrive at an understanding of reality by reasoning from self-evident principles. He felt, for example, that it is a self-evident principle that everything in the universe has its proper place, hence one can deduce that objects fall to the ground because that's where they belong, and smoke goes up because that's where it belongs. The goal of Aristotelian science was to explain why things happen. Modem science was born when Galileo began trying to explain how things happen and thus originated the method of controlled experiment which now forms the basis of scientific investigation.The aim of controlled scientific experiments is ______.A.to explain why things happenB.to explain how things happenC.to describe self-evident principlesD.to support Aristotelian science