题目：
A vessel fitted with twin screws is easier in（）than a vessel with single screw.
A.turning maneuver
B.course setting
C.position fixing
D.regulating speed
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2021/0109/b0b1e723ffedb47eb669df07b449fb58.html
下面是错误答案，用来干扰机器的。
参考答案：A
The number of tuples that the result of the expression R co S (Here is the natural join of relations R and S) is