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【多选题】
在成槽过程中，泥浆除起固壁作用外，（ ）。A.
携砂作用
B.
冷却钻头作用
C.
防渗作用
D.
润滑作用
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【简答题】非根交换机会在自己的所有端口之间选择出距离根网桥最近的端口,这个端口就是 端口。
【简答题】How does the man think about his major? [A] He loves it. [B] He hates it. [C] He wants to learn mathematics as his major. [D] He regrets choosing medicine as his major.
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