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【多选题】
党对社会主义建设道路的初步探索,留下深刻教训的有A.
必须把马克思主义与中国实际相结合
B.
必须从实际出发进行社会主义建设，建设规模和速度要和国力相适应
C.
必须发展社会主义民主，健全社会主义法制
D.
必须认识到，在社会主义初级阶段，无产阶级与资产阶级的矛盾将长期并存
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【单选题】（ ）用来阻止水流的反方向流动。安装时主意方向性，不可装反。主要用于水泵出口、水表出口等处。适用于输送清洁介质，对于带固体颗粒和粘性较大的介质不适用。
A.
止回阀
B.
闸阀
C.
浮球阀
D.
蝶阀
【简答题】请简述常用的搜索引擎有哪几个(至少说出三个)?在搜索引擎使用过程中,filetype、减号、site、双引号、intitle、inhurl、竖线、空格的功能或作用是什么?
【简答题】Mary and Her Friends Mary has some friends. They are Betty, Peter, Alice and Mike. Mary is the oldest of the five. Betty is thir years old. She is younger than Mary and older than Peter. Alice is ...
【简答题】Mary has blended the ingredients.
【单选题】'The volleyball must belong to Mary' means_________
A.
The volleyball must be Mary
B.
Mary has a volleyball
C.
The volleyball must be Mary's
D.
That can't be Mary's volleyball
【简答题】A．Mary is going to Hawaii. B．Mary has been to many countries. C．Mary likes postcards. D．Mary is traveling on business.
【单选题】Mary's uncle sent her chickens because ______ .
A.
it was Mary's birthday
B.
Mary's uncle has a good harvest
C.
chickens can lay eggs.
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