— Where is your pen pal _____?
— She's from Australia. [ ]
A. 1ive
B. from
C. to
答案:B
判断处理压力容器事故,要“稳”“准”()。
A.“好”
B.“急”
C.“快”
采煤工作面的供风量每人每分钟不低于5m3。