问题
选择题
—It's my birthday today!
—_____. [ ]
A. Thank you very much!
B. You're welcome!
C. Happy birthday to you!
D. I'm sorry!
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—It's my birthday today!
—_____. [ ]
A. Thank you very much!
B. You're welcome!
C. Happy birthday to you!
D. I'm sorry!
答案：C
sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）
/22 A