RH-31T型可燃气体测爆仪表头指示是以表示空气中含有可燃气体的危险程度来刻度的。
参考答案:对
The best way Tom suggests one’s strength is to run for 30 minutes every day.
A.building up
B.to build up
C.build up
D.being built up
两支修路队合修一条公路,甲队每天修45米,乙队每天修35米,已经修了8天,一共修了多少米?