人防工程机械排烟系统宜单独设置或与工程排风系统合并设置。当合并设置时,必须采取在火灾发生时能将排风系统()转换为排烟系统的措施。
A、手动
B、自动
C、不能
D、可以
参考答案:B
下列哪些疾病肾盂内有充盈缺损()
A.肾梗死
B.肾包膜下水肿
C.肾盂癌
D.肾盂结石
E.肾盂内血块
In no country, _____ Britain, it has been said, can one experience four seasons in the course of a single day. [ ]
A. other than
B. more than
C. better than
D. rather than