起重机外漏活动的传动轴、齿轮、传动皮带是否要装设防护罩？否则易导致什么伤害？
参考答案：
要装设防护罩。否则易导致人员铰伤。
You should do more and talk less. Actions speak louder than words.
A．What you do isn’t important.
B．What you do is as important as what you say.
C．What you do is more important than what you say.
D．What you do is less important than what you say.
生活垃圾对土壤有什么影响？
