在下面的空格中填入适当的数字或单位．
（1）106g=______kg，200mL=______cm3=______m3．
（2）某中学生的质量约是50______，一个鸡蛋的质量约是50______．
（3）水的密度是______kg/m3=______g/cm3．
（1）106g=106×10-3kg=103kg，
200mL=200cm3=200×10-6m3=2×10-4m3．
（2）∵质量的单位有：t，kg，g，mg，（1kg=1公斤，500g=1斤）
∴某中学生的质量约是50kg，一个鸡蛋的质量约是50g．
（3）水的密度是1.0×103kg/m3，
1.0×103kg/m3=1.0×103×10-3g/cm3=1g/cm3．
故答案为：（1）103，200，2×10-4．
（2）kg，g．
（3）1.0×103，1．
A rich American went into a shop in London. He wanted very much __31___ a nice looking watch. He saw a watch and liked it __32_____much that he decided to buy it. But the owner of the shop insisted five hundred dollars for it. When the American was hesitating, a young man suddenly came into the shop, took___33__out of the owner’s hand and ran out with it. It all happened in few seconds. When the owner ran out ___34____the street, the young man was already disappearing among the people. The American went on. At the next corner, he saw ___35_____with the stolen watch in his hand. “Don’t you want to buy a fine watch, sir?” he asked in a low_____36____ , “It’s only a hundred dollars.” “The young man doesn’t know _____37____saw him stealing the watch just now,” he thought. The American paid at once and went ___38______back to his room with the watch. He told his friend about the fine watch. His friend took a look at the watch and started laughing. He said, “You are ____39_____. The watch isn’t worth ___40______ten dollars. I’m sure the shop owner and the young man planned all this together.”
|
缺失，
活动桥修复。
折断，牙根断面低于牙龈2mm，不松动，无叩痛。