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【多选题】
有一碱液,其中可能只含NaOH、NaHCO3、NaCO3,也可能含NaOH和NaCO3 或NaHCO3和NaCO3,现取一定量试样,加水适量后加酚酞指示剂。用HCl标准溶液滴定至酚酞变色时,消耗HCl标准溶液V1 ml,再加入甲基橙指示剂,继续用同浓度的HCl标准溶液滴定至甲基橙变色为终点,又消耗HCl标准溶液V2 ml,问此碱液是混合物时,V1和V2是如下何种关系A.
V1>0 V2 =0
B.
V1=0 V2>0
C.
V1>V2
D.
V1< V2
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举一反三
【单选题】卸扣使用应注意（） ①不许超负荷作业； ②不可横向受力； ③带螺纹的横栓不得碰损； ④卸扣不用时横销要上油以保持润滑。
A.
①②③④；
B.
①③④；
C.
②③④；
D.
①②③。
【单选题】She once said,' When people ask me whether writing has been a hard or easy road I always answer with the famous saying: The end is nothing; the road is all. That is what I mean when I say writing has ...
A.
simple and lively
B.
opened up a road to success
C.
neither too hard nor too easy
D.
interesting and enjoyable
【单选题】The Fall It looked as if nothing could destroy the happiness Adam and Eve experienced in the Garden of Eden where God had created everything so wonderful and perfect. But one day when Eve was standing...
A.
seduced
B.
suggested
C.
stimulated
D.
encouraged
【单选题】The Fall It looked as if nothing could destroy the happiness Adam and Eve experienced in the Garden of Eden where God had created everything so wonderful and perfect. But one day when Eve was standing...
A.
Satan tempted Adam and Eve.
B.
Paradise in the garden of Eden
C.
Adam and Eve ate the forbidden fruit.
D.
The reason why Adam and Eve had to leave the garden.
【单选题】She has said nothing ________ your request.
A.
regards
B.
regarding
C.
regarded
D.
regardless
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