对货车脱轨自动制动装置进行外观检查,须符合哪些要求?
参考答案:
①各部位紧固件松动时紧固;
②配件丢失时应补上;
③管路漏泄时应消除;
④不锈钢球阀手把应置于开放位。
在资料分析阶段常采用哪种方法可适当控制混杂偏倚
A.限制
B.随机化
C.分层分析
D.重复
E.多因素分析
I really want to know _______. [ ]
A. what is wrong with my brother
B. how will he go to Beijing tomorrow
C. if had he bought that car
D. where did he go yesterday