井口主信号工误发信号后,应立即发正确信号。()
参考答案:错
小明用平面镜将一束太阳光反射到竖井底(如图所示),请在图上作出平面镜的位置.(保留作图痕迹)
. ______ is the kindness of the nurse that the patient can never be ______ to her.
A.So; too thankful
B.Such; too thankful
C.So; that thankful
D.Such; thankful such