脊髓灰质炎临床分期中,“吻膝试验阳性,患者坐起、屈颈时唇不能接触膝部”属于()
A.前驱期
B.瘫痪期
C.恢复期
D.瘫痪前期
E.后遗症期
参考答案:D
__________there was something wrong with the washing machine. [ ]
A. It seems
B. It seemed that
C. He seemed
D. It seems that
无线传播损耗分为()
A.自由空间损耗
B.快衰落损耗
C.阴影衰落损耗
D.多普勒频移