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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.
【单选题】某工程大厅地面镶贴，设计要求为满谱大理石，缝隙为5mm，损耗率为1%，大理石规格为400mm×400mm，用计算法确定每100m2地面所需消耗大理石材料数量为（）块。
A.
520
B.
616
C.
650
D.
696