肺通气的原动力是
A.胸内压的变化B.肺主动舒缩C.外界环境与肺内压力差D.呼吸肌的舒缩E.肺泡表面活性物质的作用
参考答案:D
The soap opera “Young Lives” is . We are all in it.
A.interesting; interesting
B.interested; interested
C.interesting; interested
D.interested; interesting
中级电路表中,如果不修改下级基站的OML时隙所对应的中继电路类别,是否会影响通话?为什么?