固位体的主要功能是________其次是_________和________作用。
GB/T8878—2002规定底边脱针,每面一针两处,但可以连续。
A. 正确
B. 错误
Which firefighting method is an example of an indirect attack on a fire?().
A. Bouncing a straight stream of water off the overhead to create spray effect
B. Spraying foam on a bulkhead and letting it flow down and over a pool of burning oil
C. Flooding a paint locker with CO2 and sealing the compartment
D. Cooling adjacent bulkheads with water to prevent the spread of the fire by conductio
对流层自由大气中,高度增加,风的一般变化规律是:().
A. 风向趋近于东风,风速增大
B. 风向趋近于西风,风速减小
C. 风向趋近于东风,风速减小
D. 风向趋近于西风,风速增大