输油泵的输油量应是全负荷最大喷油量的（）
A、1~2倍
B、3~4倍
C、5~6倍
D、8~9倍
参考答案：B
将融合的杂交瘤细胞稀释，实际每个培养孔是 （）
A.一个细胞
B.没有细胞
C.没有或一至几个细胞
D.几个细胞
E.一至几个细胞
—Do you know the woman who is wearing a beautiful hat?
—Yes. She is _______ mother. She is a great writer. [ ]
A. Tom and Mike's
B. Tom's and Mike
C. Mike and Tom
D. Tom's and Mike's
