原发性肝癌最早转移的途径是：（）
A.肝内转移
B.血行转移
C.淋巴转移
D.种植转移
E.以上均不是
参考答案：A
The person changed his clothes and wore dark glasses to avoid _______.
A．being recognized
B．having been recognized
C．having recognized
D．recognizing
单相照明变压器的初级工作电压为（）。
A、380V或220V
B、400V或250V
C、380V
D、220V
