【单选题】The earliest humans arrived several million years ago, but only 150,000 to 00,000 years ago, did cultures, language, and the arts._____
【单选题】The earliest humans arrive several million years ago, but only 150,000 to 200, 000 years ago, did cultures, language and the arts ________.
【单选题】(47703) 在提速道岔上进行养护维修时,应注意观察尖轨跟部限位器 A 、 B 块的间隙变化。道岔位于跨区间无缝线路区段,在锁定温度下,间隙应符合()的要求。
【简答题】The earliest humans had access to only a very limited number of ________ materials, such as : stone, wood, clay, skins, and so on . With time they discovered techniques for producing materials that ha...
【单选题】In the space provided, write the letter of the sentence that best expresses the implied main idea of each of the following paragraphs. ____ 1 The earliest humans probably used the lengthening and shor...
A.
Throughout history, people have found better and better ways to measure the passing of time.
B.
The hourglass is a slightly more recent invention than the sundial.
C.
The first methods of measuring the passing of time took advantage of the changing shadows cast by the sun throughout a day.
D.
A primitive clock invented in about 1300 was the most exact way to tell time up to that point.
【单选题】在提速道岔上进行养护维修时,应注意观察尖轨跟部限位器 A.B块的间隙变化(中级线路工用)。道岔位于跨区间无缝线路区段,在锁定温度下,间隙应符合()的要求(中级线路工用)。
【多选题】下列关于税法要素的表述中,不正确的有()。