链传动的失效形式有链的()、链条铰链的()、链条铰链的()以及链条的()。
参考答案:疲劳破环;磨损;胶合;静力拉断
()the temperature might drop, coal was prepared for warming,
A. To consider
B. Considered
C. Considering
D. To be considered
桥式起重机的驾驶室突出面与建筑物的距离不应小于()。
A.40cm
B.20cm
C.30cm
D.10cm