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It's ________ to stick your chopsticks into your food while having a meal.
1年前
如图所示,有一个固定在水平桌面上的汽缸,内部密闭了质量为m的某种理想气体. (1)如果这种理想气体的摩尔质量为M,阿伏伽德罗常数为N,则汽缸中气体分子数:n=_______.
1年前
1年前
For many years, no one could communicate with people who had been born without hearing.
1年前
Jean is going to play _____________ after school. [ ]
1年前