A.the computer is not used to forecast specific local events
B.the computers are not advanced enough to predict it
C.the weather data people collect are often wrong
D.weather conditions in some small regions are not available
第3题
电梯噪声测试、机房内应不大于()dB,轿厢运行时应不大于()dB,轿门与层门开门过程中不大于()dB。
A.55
B.80
C.65
D.50@@@SXB@@@A.55
B.80
C.65
D.50@@@SXB@@@A.55
B.80
C.65
D.50
第7题
GB/T10058规定:载货电梯仅考核机房噪声值。平均值应≤()dB(A)
A.55
B.60
C.65
D.80
第9题
额定速度不大于2.5m/s的电梯,运行时机房最大噪声不大于()
A.55
B.80
C.65
D.70
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