THDS-A探测系统中热敏探头工作方式为（）
A.直流探头
B.光子探头
C.调制探头
D.交流探头
参考答案：A
Call me when you_ ____at the railway station, Alice, I’ll go there to meet you.
A．arrive
B．would arrive
C．have arrived
D．are arriving
