()的肋关节凹和横突肋凹承接肋骨。
A、颈椎
B、胸椎
C、腰椎
D、尾椎
参考答案:B
—Who is cooking the meal in the kitchen?
—Mum _____ the meal.[ ]
A. cook
B. is cooking
C. cooked
D. cooks
下列哪种情况是由于手机和基站间的障碍物引起的()。
A.瑞利衰落(Rayleigh fading)
B.阴影效应(Shadowing)
C.路径衰耗(Path loss)