得到____(děi dé) 桦树____(huá huà) 倒水____(dào dǎo)
秤杆____(ɡān ɡǎn) 神奇____(sén shén) 号叫____(háo hào)
二元一次方程3x+2y=15在自然数范围内的解的个数是( )
The place _____the bridge is supposed to be built should be _____the cross river traffic is
the heaviest.