劳务的开始和完成分属不同的会计年度,应在劳务完成时确认收入。()
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Condensate must be drained periodically from the air compressor receivers to prevent ().
A. second stage cylinder lockup
B. oil sump contamination
C. faulty operation of pneumatic valves
D. corrosion of air receiver baffle
游梁中分线与底座中心点对正偏差不超过()mm。
A. 0.5
B. 1.0
C. 1.5
D. 2.0
某城市共有A、B、C、D、E五个区,A区人口是全市人口的5/17,B区人口是A区人口的2/5,C区人口是D区和E区人口总数的5/8,A区比C区多3万人,全市共有多少万人?()
A. 20.4
B. 30.6
C. 34.5
D. 44.2