题型:问答题 I hate it when she calls me at work—I’m always too busy to () a conversation with her.A. carry onB. break intoC. turn downD. cut off 查看答案
题型:问答题 钛酸钡的热稳定性好,介电常数高,在小型变压器、话筒和扩音器中都有应用。钛酸钡晶体的结构示意图如图所示,它的化学式是 [ ]A.BaTi8O12 B.BaTi4O6 C.BaTi2O4 D.BaTiO3 查看答案