【单选题】It is often more difficult to find trained men than __________.
A.
getting financial support
B.
in getting financial support
C.
to get financial support
【单选题】It is often more difficult to find trained men than ( ).
A.
getting financial support
B.
in getting financial support
C.
to get financial support
【单选题】Color-blind people often find it difficult to ______ between blue and green.
【单选题】________ 是我国第一部,也是世界上最早的国家药典。
【单选题】某一化学反应中反应物B的物质的量浓度在5s内从4.0mol?L -1 变成1.0mol?L -1 ,在这5s内B的化学反应速率为( )
【单选题】[普化5] 下列各物质的分子间只存在色散力的是( )。