下列物质中最简式相同,但既不是同系物,也不是同分异构体,又不含相同官能团的是[ ]
A.
B.乙炔和苯
C.
D.甲醛和甲酸甲酯
答案:B
Our school is ______ a bank. [ ]
A. next
B. next to
C. between
D. between and
某地区在1周内进行了高血压普查,可计算当地高血压的()
A.罹患率
B.发病率
C.患病率
D.病死率
E.续发率