制动器不能刹住重物的原因是什么?
参考答案:
制动器杠杆系统中有的活动铰链被卡住;制动轮工作表面有油污,制动带磨损,铆钉裸露;主弹簧张力调整不当或弹簧疲劳,制动力矩过小所致。
根据句意及首字母的提示,补全单词。
1. The a picture makes me sad.
2. I like the p sweater. What about you?
3. L music makes me want to dance.
4. S movies make me want to leave.
5. Restaurant owners have to know how to m money.
干槽症的主要症状是()
A.出血
B.疼痛
C.拔牙创内肉芽水肿
D.骨壁轻微触痛
E.体温升高