原发性青光眼分为（）。
A.开角型青光眼
B.先天性青光眼
C.外伤性青光眼
D.闭角型青光眼
E.激素性青光眼
参考答案：A, D
________， the fire wasn't discovered after it had started.[ ]
A．Happily
B．Fortunately
C．Quickly
D．Unfortunately
大理石和花岗石板材之间接缝严密．其缝隙宽度不应大于2mm或按设计要求。( )
