“固氮作用”的英语词汇是______()
A. nitrogen fixation
B. free oxygen
C. by-product
D. the amount of proteins
“副产品”的英语词汇是______()
A. by-product
B. nitrogen fixation
C. the amount of proteins
D. free oxygen
Which of the following is the name of CuI()
A. copper (I) iodide
B. cuprous chloride
C. copper (II) iodide
D. cupric iodide
“三键”的英语词汇是__()
A. a triple bond
B. nitrogen fixation
C. a double bond
D. a single bond