听力原文:Do you know whether Mr. Caldini is planning to attend the conference?
(A) I wasn't planning on it.
(B) I don't think I can.
(C) I think he is.
(25)
A.
B.
C.
第5题
液压电梯冬季如果室温太低,应加热使油温不低于()℃,夏季高温季节注意检测油温不得超过()℃。油温过高使液压件易于磨损,油液加速老化,降低液压系统使用寿命。
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