癥瘕多因脏腑不和，气机阻滞，瘀血内停所致，____为瘕，____为癥。
参考答案：气聚；血结
It was Friday. We were asked to write a______composition.
A．200 words
B．200-word
C．800-word
D．800 words
当相邻两层地坎之间距离超过llm时，在其间井道壁上开设的通往井道供（）用的门，井道安全门。
A、安装
B、维修
C、援救乘客
D、检查
