下列哪个地区是世界第一大石油生产地区()
A.北美地区
B.亚太地区
C.中东地区
D.非洲
参考答案:C
There is clear evidence _____ the most difficult feeling of all to interpret is bodily pain. [ ]
A. what
B. if
C. how
D. that
当消防喷淋系统的喷头公称直径小于()时,应在配水管上安装过滤器。
A.10mm
B.15mm
C.20mm
D.25mm