下列物质为固态时，必定是分子晶体的是[ ]
A．酸性氧化物
B．非金属单质
C．碱性氧化物
D．含氧酸
答案：D
无粘接预应力筋护套轻微破损者应外包防水塑料胶带修补，严重破损者不得使用。( )
_______ did he tell his wife ________ he wished to do
A．That...what
B．What...that
C．Where...which
D．Which...where
