--- Could you tell me        ?    

--- Certainly. In half an hour.

A．when will the train to Chengdu leave

B．when the train to Chengdu left

C．when would the train to Chengdu leave

D．when the train to Chengdu will leave

正常肾上腺的MRI信号与肝实质信号强度相比（）

A.T₁及T₂加权像均为等信号

B.T₁加权像低信号、T₂加权像高信号

C.T₁加权像高信号、T₂加权像低信号

D.T₁及T₂加权像均为高信号

E.T₁及T₂加权像均为低信号