【单选题】
手持行灯电压不准超过（ ）V。___
A. 12
B. 24
C. 36
D. 48
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答案
C
解析
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起重机停放或行驶时，其车轮、支腿或履带的前端或外侧与沟、坑边缘的距离不准小于沟、坑深度的（ ）倍；否则应采取防倾、防坍塌措施。___
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