估算的结果比准确值要大一些.______(判断对错)
如12×33≈300,而准确值是12×33=396,估算的结果小于准确值.
故答案为:×.
Bill suggested _____ a meeting on what to do for the Shanghai Expo during the vacation.
A.having held
B.to hold
C.holding
D.hold
汽车排气中的氮氧化物(NOx)和碳氢化合物(HC)是形成光化学烟雾的主要前体污染物。