滴定管的使用方法包括（）。
A、读数、记录
B、洗涤、涂油
C、试漏、装溶液
D、赶气泡、滴定
参考答案：B, C, D
—Was it by cutting down staff are not diligent enough she saved the firm?
—No, it was by improving work efficiency．
A．that; when
B．that; what
C．who; how
D．who; that
流一词的英文单词是（）
A.logistiCs
B.DistriBution
C.trAnsportAtion
D.stoCk
