一般指示灯均串联电阻使用,某指示灯型号为XZ-2.5-0.4A,接于36V的电压上该串联()电阻。
A.64Ω
B.120Ω
C.57Ω
D.84Ω
参考答案:D
月经周期为28天的妇女,要取子宫内膜活检,测定是否有排卵,最好在周期的第()
A.7~9天
B.11~12天
C.13~15天
D.17~19天
E.26~27天
Attcntion, please. There _____ a football game between China and Korea this evening. [ ]
A. is going to be
B. has been
C. has
D. will have