单项选择题

下列关于干熄焦安全技术措施的说法，错误的是（　　）

A.干熄焦主框架装入层平台及干熄焦地层平台应设置事故用水管
B.除尘器的布袋等滤材应采用防静电材质，并对设备进行可靠接地
C.旋转密封阀两侧密封腔的气体压力应小于干熄炉入口循环气体压力
D.振动给料器和旋转密封阀周围应设置一氧化碳和氧浓度监测、声光报警装置
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Snow RangerThe two things—snow and mountains—which are needed for a ski area, are the two things that cause avalanches, large mass of snow and ice crushing down the side of a mountain—often called White Death.It was the threat of the avalanche and its record as a killer of man in the western mountains that created the snow ranger. He first started on avalanche control work in the winter of 1937 at Alta, Utah, in Wasatch National Forest.This mountain valley was becoming well known to skiers. It. was dangerous. In fact, more than 120 persons had lost their lives in 1936 and another 200 died in 1937 as a result of avalanches before it became a major ski areA.Thus, development of Alta and other major ski resorts in the west was dependent upon controlling the avalanchE.The Forest Service set out to do it, and did, with its corps of snow rangers.It takes many things to make a snow ranger. The snow ranger must be in excellent physical condition. He must be a good skier and a skilled mountain climber. He should have at least a high school education, and the more college courses in geology, physics, and related fields he has, the better.He studies snow, terrain, wind, and weather. He learns the conditions that produce avalanches. He learns to forecast avalanches and to bring them roaring on down the mountainsides to reduce their killing strength. The snow ranger learns to do this by using artillery, by blasting with TNT, and by the difficult and skillful art of skiing avalanches down.The snow ranger, dressed in a green parka which has a bright yellow shoulder patch, means safety for people on ski slopes. He pulls the trigger on a 75 mm. Recoilless rifle, skis waist deep in powder testing snow stability, or talks with the ski area's operator as he goes about his work to protect the public from the hazards of deep snow on steep mountain slopes.The snow rangers are employees of ______.A.the Forest ServiceB.the Resource BureauC.the Tourist BoardD.the Sports Bureau
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单项选择题
下列关于防火堤应符合的要求，说法正确的是（ ）
A.防火堤内单槽容量不大于1000m3且闪点高于1200℃的液体储槽，严禁超过两行
B.防火堤内有效容积应小于最大槽的容量
C.防火堤内侧基脚线至立式储槽外壁的距离不应小于槽壁高的一半
D.卧式储槽至防火墙内侧基脚线的水平距离不应小于0.8m
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