A:掉在水泥地上,玻璃杯的动量大
B:掉在水泥地上,玻璃杯的动量变化大
C:掉在水泥地上,玻璃杯受到的冲量大,且与水泥地的作用时间短,因而受到水泥地的作用力大
D:掉在水泥地上,玻璃杯受到的冲量和掉在软泥地上一样大,但与水泥地的作用时间短,因而受到水泥地的作用力大
Hearing the good news that he had been admitted into his dream university after so many years of hard work, his parents couldn't help b____ into tears.
解释下列词语
①青螺
②潭面