乘客电梯的层门门扇与门扇、与门套、与门楣、与地坎的间隙最大不得大于()mm。
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控制文件柜5VDC电源调节器的LEDs用于指示卡件工作状态,()表示卡件坏,更换卡件
A. CARD FAULT(DS4)
B. 5 FUSE BLOWN(DS2)
CARD GOOD(DS1)
D. +5VDC STATUS(DS5)
预热区在焊道两侧,每侧宽度均应大于焊件厚度的()倍以上,且不应小于()mm。
A. 1.2,80
B. 1.5,80
C. 1.5,100
D. 1.2,100
()is not an advice be observed when samples are taken in tanks containing volatile petroleum products.
A. Filter masks with a combination filter should be brought and used whenever necessary
B. Only explosion-proof equipment(marked EEx)should be used
C. Avoid breathing petroleum gases,especially if they come from sour crude(smell of rotten eggs)
D. so far as possible,take early and substantial action to keep well clear
主提升机翻罐工正常提升时需将“允许开车/急停”转换开关旋转到允许开车位置。
A. 正确
B. 错误