在生产井中，压力低开关只安装在（）。
A、油嘴的下游
B、油嘴的上游
C、油嘴的上、下游
参考答案：C
---I will not come here tomorrow.
--- It makes no ______ to me, because I don’t care.
A．arrangement
B．matter
C．accommodation
D．difference
临界融合频率
