( )可用于在围岩自稳能力好、断层裂隙少的地层中修建地下洞室。
A.全断面开挖方式
B.先导洞后扩大开挖方式
C.台阶扩大开挖方式
D.分部分块开挖方式
参考答案:A
The journey around the world took the old sailor nine months, _____ the sailing time was 226 days.
A.of which
B.during which
C.from which
D.for which
肿瘤见于
A.甲状腺功能减低症B.苯丙酮尿症C.胸腺发育不全D.21-三体综合征E.手足搐搦症