胆固醇合成途径中的关键酶是()
A.果糖二磷酸酶-1
B.6-磷酸果糖激酶-1
C.HMG-CoA还原酶
D.磷酸化酶
E.HMG-CoA合成酶
参考答案:C
—Did you have any difficulty catching yesterday’s lecture?
—No. The professor spoke very clearly to make his speech easy _____.
A.understood
B.understanding
C.to be understood
D.to understand
当待并列发电机和系统的电压相位不同时,如相位差超过(),则冲击电流很大,会使定子绕组和轴受到一个很大的冲击应力,使定子端部绕组严重变形。
A、±30°
B、±10°
C、±20°
D、±50°