单选题:关于外用电梯安全控制的说法,正确的是(  )。

题目内容:
关于外用电梯安全控制的说法,正确的是(  )。 A.外用电梯由具有相应资质的专业队伍安装完成后经监理验收合格即可投入使用
B.外用电梯底笼周围2.5m范围内必须设置牢固的防护栏杆
C.外用电梯与各层站过桥和运输通道进出口处应设常开型防护门
D.7级大风天气时,在项目经理指导下使用外用电梯

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