A.撐木 B.厚木板、鋼板等 C.塑料布、席子、鋸木粉等 D.A、B、C均可
A.it is impractical to locate them outside B.there is also a control valve outside C.the CO2 cylinders are also in the space D.an automatic heat-sensing trip is installed
A.Ⅰ~Ⅴ B.Ⅱ~Ⅴ C.Ⅰ、Ⅱ、Ⅳ,Ⅴ D.Ⅰ、Ⅱ、Ⅲ、Ⅳ
A.黃磷和雷汞 B.酒精和雞蛋 C.香蕉和蘋果 D.茶葉和肉類
A.at B.in C.by D.with
A.does not break the towline B.does not get too much way on the vessel C.keeps a steady course so the towline will remain tight D.turns the ship toward the direction of pull
A.air being warmed above the dew point B.saturation of cold air by rain C.a rapid cooling of the air near the surface of the Earth at night D.warm moist air being blown over a colder surface
A.NE B.NW C.SE D.SW
A.navigate as close to the left descending bank as safety permits B.navigate as close to the right descending bank as safety permits C.turn into the inflow channel as the bypass is now open D.slow your engine speed to not more than 5 mph
A.in B.on C.with D.by