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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.
相关题目：
【判断题】除盐系统中,阴离子交换器一般都置于阳离子交换器之后。( )
A.
正确
B.
错误
【单选题】旋转刮板式热交换器可用在（）。
A.
蒸发
B.
干燥
C.
冷冻
D.
B和C
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.
【单选题】以太网交换器具有（）
A.
既能隔离网段又能连接网段的功能
B.
隔离网段的功能
C.
连接网段的功能又能路由的功能
D.
连接网段的功能
【判断题】离子交换器运行时，将水温提高到30～50℃，可以得到比较好的交换效果。（）
A.
正确
B.
错误
【单选题】一般石英砂过滤的冲洗强度为12~15L（s²m2），水冲的时间为（）min。
A.
2~1
B.
3~2
C.
5~3
D.
7~5
【单选题】熔断器中充满石英砂的作用是（）。
A.
增强灭弧能力
B.
绝缘
C.
提高密封性