发电机升压过程中应注意()。
A.三相定子电流应等于零;
B.三相定子电压应平衡;
C.核对空载励磁电流;
D.核对负序电流有无超过规定值。
参考答案:A, B, C
骨折三期用药中期可选用:()。
A.复原活血汤
B.桃红四物汤
C.壮筋养血汤
D.当归丸
E.接骨续筋汤
There are _____ of students in our school but only _____ of them are girls. [ ]
A. hundred; two hundred
B. hundreds; two hundreds
C. hundreds; two hundred