【单选题】This river is _____ that one.
A.
as three times long as
C.
three times the length of
【单选题】若原子吸收的定量方法为标准加入法时,消除了下列哪种下扰 ?
【单选题】It’s said that the team __________ twelve top European players.
【简答题】微量元素(minor element,microelement或trace element)
【单选题】Usually passengers are required to arrive at _____ one hour before ______ takes off.A.airport; ai
A.
8. Usually passengers are required to arrive at _____ one hour before ______ takes off. A.airport; aircrafts
C.
an airport, a aircraft
D.
the airport, the aircraft
【单选题】若原子吸收的定量方法为标准加入法时,消除了下列()干扰。
【简答题】______________8. One way, (BrE).
【单选题】My sister has two skirts. One is yellow,_________ is black.
【单选题】若原子吸收的定量方法为标准加入法时, 消除了下列哪种干扰