【单选题】EDTA与金属离子形成螯合物时,EDTA与金属离子的配位比一般为 ( )
【判断题】液体单位体积内所具有的称为质量容重。()
【单选题】From the end of the passage we would expect the author to start his next paragraph most probably on______.
A.
how the senior citizens of the United States responded to the new legislation
B.
the opinions of the few who anticipated what the reaction of the elderly was to be
C.
what the legislators would consider doing to avoid further legislative digressions
D.
major competing ideologies that differ on the coming congressional budget
【单选题】关于汉坦病毒的致病性,下列叙述哪项不正确
【单选题】下列关于 EDTA 与金属离子形成螯合物的叙述,正确的是
A.
EDTA 与金属离子形成螯合物时,生成多个六原子环。
B.
EDTA 与 Mg2+ 离子形成 1:2 螯合物。
C.
EDTA 与 Fe3+ 离子形成 3:4 螯合物。
D.
EDTA 与金属离子形成螯合物时,生成多个五原子环