察鼻时，肺闭的特点为
A．鼻塞流涕B．鼻孔干燥C．鼻翼煽动D．鼻孔出血E．鼻涕浊臭
参考答案：C
He doesn’t know the city very well, because this is the first time he _______ here.
A．came
B．has been
C．come
D．am coming
有一横截面积是2厘米2的圆柱形容器，分别装20克水和16克某种液体，液面高度相同．那么这种液体的密度是______，这种液体对容器底部的压强是______．
