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【单选题】根据以下答案，回答题磷酸盐缓冲液、硼酸缓冲液查看材料
A.
滴眼剂的pH调节剂
B.
滴眼剂的渗透压调节剂
C.
滴眼剂的抑茵剂
D.
滴眼剂的黏度调节剂
E.
滴眼剂的抗氧剂
【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.