Researchers in Russia ______ the map issue in a past study by capturing Eurasian reed-warblers on the Baltic Sea as they flew northeast towards their breeding grounds near Saint Petersburg.
举一反三
- Saint Petersburg situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, it was founded by______in 1703. A: Ivan the Great B: Ivan the Terrible C: Peter the Great D: Michael Romanov
- <p>When determining who gets authorship on a scientific paper, researchers should:</p>
- Only in the past few years _______ to improve the living conditions in this area. </p></p>
- In universities, students also study (political) _______________ in addition to their major subjects. </p></p> ______
- 下面Verilog代码对应的输出波形为？ <p></p> <p></p> <p></p> <p>`timescale 1ns/1ns</p> <p></p> <p></p> <p>module test;</p> <p></p> <p></p> <p>reg clk,rst;</p> <p></p> <p></p> <p>initial fork</p> <p></p> <p></p> <p>clk=0;</p> <p></p> <p></p> <p>rst=1;</p> <p></p> <p></p> <p>#10 rst=0;</p> <p></p> <p></p> <p>#20 rst=1;</p> <p></p> <p></p> <p>forever</p> <p></p> <p></p> <p>begin</p> <p></p> <p></p> <p>#10 clk=1;</p> <p></p> <p></p> <p>#5 clk=0;</p> <p></p> <p></p> <p>end</p> <p></p> <p></p> <p>join</p> <p></p> <p></p> <p>endmodule</p> <p></p>