海绵窦内侧壁相邻的是()海绵窦后部相邻的是()海绵窦下壁相邻的是()
A.卵圆孔、圆孔
B.视神经管
C.颈内动脉管和半月节
D.垂体蝶鞍
E.颞叶
参考答案:D,C,A
By the year 2015, all of China's museums will be free to enter. We _____ visit any museum without paying. [ ]
A. can
B. need
C. must
D. should
电磁调速异步电动机的输出转速主要取决于().
A.异步电动机的转速
B.气隙的大小
C.励磁电流的大小