A:13C与15N有相同的中子数
B:13C与C60互为同素异形体
C:15N与14N互为同位素
D:15N的核外电子数与中子数相同
18÷____=2 64÷____=8 21÷____=3
36÷____=9 28÷____=7 40÷8=____
7×____=35 8×____=32 ____×6=42
I like sweet-and-sour pork ribs(糖醋排骨)_____ my mother cooks.