A person with sleep apnea will possibly have the symptom like ______.
A.failing to wake up in the morning
B.stopping breathing repeatedly
C.failing to concentrate on his thinking
D.staying awake all the night
第1题
当钢丝绳严重磨损,其外层钢丝直径减小超过()时,钢丝绳应立即报废。
A.50%
B.40%
C.10%
D.7%
第5题
当钢丝绳严重磨损,其直径小于公称直径的()时,钢丝绳应立即报废。
A.20%
B.40%
C.13%
D.7%
第7题
当钢丝绳外层钢丝磨损达到其直径的()时,钢丝绳应报废。
A.40%
B.20%
C.30%
D.10%
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