每分钟吸入肺泡的新鲜空气量乘以呼吸频率为
A．肺活量B．用力呼气量C．肺总容量D．肺泡通气量
参考答案：D
盈亏平衡点生产能力利用率=（年销售收入-年变动成本-年销售税金）÷年固定成本×100%。（）
Although they wanted to keep it quiet, news of the job loses ________ very quickly.
A．got by
B．got out
C．got over
D．got off
