客房清洁卫生体现了饭店的管理水平，也是服务质量的全部内容。
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在建筑施工图中，一般有图标、比例、（）、标高、尺寸单位和详图索引号等。
PLC的可靠性高，抗干扰能力强，通用性好，适应性强。
A. 正确
B. 错误
How should you signal the crane operator to lower the boom and raise the load?（）.
A. Extend arm and point finger in the direction to move the boom
B. Extend arm with the thumb pointing downward and flex fingers in and out
C. With f rearm vertical and forefinger pointing up,move hand in small horizond circles
D. With arm extended downwards and forefinger pointing down,move hand in small horizontal circle
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