由于泵的(),泵的实际流量小于理论流量。
A、泄漏
B、冲击
C、速度
参考答案:A
He is confident, _____, in my opinion, is most important in society. [ ]
A. how
B. that
C. what
D. which
选择洞轴线位置时应考虑哪些因素?