流化床干燥速度下降阶段的特征是（）。
A.颗粒温度升高至近进风温度
B.颗粒恒温加热阶段
C.水分流失速度逐渐加快
D.水分流失速度逐渐减慢
参考答案：B
The results of the medical checkup suggested that my father ______ in poor health, so the doctor suggested that he ______ smoking and take more exercise.
A．was; gave up
B．be; should give up
C．should be; gave up
D．was; give up
胸外心脏按压的理论基础是（）
A．肺泵机制
B．心泵机制
C．胸泵机制
D．主动脉机制
E．肺动脉机制
