写成《制碱》一书，发明“侯氏制碱法”的化学家是：
侯德榜
This book will show you ________ can be used in other contexts.
A．how you have observed
B．how what you have observed
C．that you have observed
D．how that you have observed
下列各项中，不属于行政行为效力的有（）。
A.确定力
B.拘束力
C.公定力
D.强制性
