崇明越江通道建设中的隧道工程全长约为9.0×103米,其中9.0×103有______个有效数字.
9.0×103的有效数字是:9,0,有2个有效数字.
故答案为:2.
用所给词的正确形式填空,完成句子。
l. Today is February (fifteen).
2. I (eat) the ice cream yesterday.
3. I wanted (fly) a kite, but it (be) too hard.
4. I hurt (I) arm and Jenny helped (I).
5. You were (sleep) on the train.
人工喂养儿,体重6kg,用8%糖牛乳喂养,每日除牛奶外还需喂水多少毫升
A.60mlB.120mlC.240mlD.300mlE.360ml