What is the accepted standard for wire rope falls used in connection with the lifeboat gear?()
A. Six by seven galvanized wire rope
B. Six by twenty-four improved plow steel wire rope
C. Six by thirty-seven preformed fiber-core wire rope
D. Six by nineteen regular-lay filler wire rope
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DB11/420-2007《电梯安装、改造、重大维修和维护保养自检规则》中规定:电梯的安装、改造、重大维修应在()的基础上向检验检测机构提出监督检验申请。
A. 竣工
B. 自检合格
C. 使用单位验收合格
D. 运行无故障
太阳能电池材料主要是太阳能利用()进行电转换的材料。