A．中的X是中子
B．是α衰变
C．是核聚变
D．是核裂变
答案：C
As fuel prices rose, bus companies raised their fares and ________.[ ]
A. so did the airlines
B. nor did the airlines
C. so the airlines did
D. nor the airlines did
体液平衡中细胞外液最重要的阴离子是（）
A.HPO2-4
B.HCO-3
C.SO2-4
D.CI-
E.蛋白质
