料层中颗粒的重度增大时,沸腾临界流量随之()。
A.增大
B.减小
C.不变
参考答案:A
It is said that Columbus was the first one who ______ America.[ ]
A. found
B. discovered
C. found out
D. looked for
为了能够做到第一时间接待客户,快速接待台应该保证有()。