悬臂皮带机的减速器发生异常声音原因何在?
参考答案:
(1)齿轮啮合不好或个别齿轮有损坏
(2)油中有硬颗粒架物
(3)轴承损坏
(4)地脚螺丝松动
(5)靠背轮中心不正。
Though ______ _money, his parents managed to send him to a key university.
A.lacked
B.lacking of
C.lacking
D.lacked in
()不属于发送标志的内容。
A、货物的质量、件数
B、货物的特性、种类、型号、外形尺寸
C、收发货人、送达地点