He said he would come . He didn't _______.

A．besides

B．but

C．though

D．either

设计的注塑模闭合厚度必须满足下列关系：（），若模具闭合厚度小于注塑机允许的模具最小厚度时，则可采用加垫块来调整，使模具闭合。