【简答题】“Welcome to Dialogue, President Carter. I was told that your birthday is on October 1st, which also happens to be our National day.”采取了()礼貌策略。
【判断题】2阳离子交换树脂的性能较阴离子交换树脂强。
【单选题】下列性质中不属于纯铁的物理性质的是( )
【简答题】用恰当的单词填空,完成对话。每空一词。 A: Our National Day is coming. I'm looking forward to it. B: Me, too. As we know, it's the 1.________ birthday of the PRC. A: What are you going to do celebrate it? B: A great mili...
【单选题】关于离子交换法,下列说法不正确的是:( )
A.
在常温和稀溶液中,以下离子交换的顺序为: Al3+ 、 Ca2+ 、 Mg2+ 、 Na+
B.
弱酸性阳离子交换树脂只能在碱性溶液中才有较高的交换能力
C.
强酸性阳离子交换树脂常采用的活性基团有 -SO3H 和 -COOH
D.
吸附达到饱和的阴离子交换树脂可利用高浓度 NaOH 或 NaCl 溶液进行再生