机组振动的评定的依据是多方面的，（）不是其中之一。
A.轴向方向
B.垂直方向
C.水平方向
D.圆周方向
参考答案：D
不符合IDA的实验检查结果是（）
A.总铁结合力增加
B.骨髓外铁染色示铁消失
C.转铁蛋白饱和度下降
D.红细胞游离原卟啉下降
E.形态学呈小细胞低色素性贫血
— We didn't find the Blacks during the lecture.
— No one had told them about _____ a lecture. [ ]
A. there to be
B. there being
C. there be
D. there was
