每次使用沼气用具前,都要注意检查开关是否关闭,并注意保持室内空气流通。
参考答案:对
右心房增大首先发生在下列哪个部位()
A.主动脉隆突
B.Koch三角
C.固有心房
D.冠状窦口
E.右心耳
The young lady coming over to us()our English teacher; the way she walks tells us that!
A.must be
B.can be
C.would be
D.could be