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【多选题】
滤料应具有足够的（ ）性能，并不得含有有害成分，一般可采用石英砂、无烟煤和重质矿石等。
A.
机械强度
B.
耐磨
C.
化学稳定
D.
热稳定
参考答案：
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.