磁致伸缩式液位仪探棒测量的液位高度可准确至()。
A、±0.1mm
B、±0.3mm
C、±0.5mm
D、±0.7mm
参考答案:C
---Alice, you look puzzled, Have you understood it?
---Yes.I _____another problem just now.
A.l have thought of
B.am thinking of
C.had thought of
D.was thinking of