三相异步电动机在额定转速下运行时,其转差率()。
A. 小于0.1
B.接近1
C.大于0.1
D. 无穷大
参考答案:A
When we there, they _ there for an hour.[ ]
A. got; had been
B. got; got
C. reached; arrived
D. reached; had got
处处与重力方向垂直的液体表面称为()。
(A)椭球体表面;
(B)参考椭球面;
(C)水准面;
(D)高斯投影面。