为防止微小动脉的信号丢失，首选（）
A.2DTOF
B.3DTOF
C.3DCEMRA
D.2DPC
E.黑血技术
参考答案：B
What______it is to go swimming in ________weather!
A．a great fun, so fine
B．a great fun, such a fine
C．great fun, so fine a
D．great fun, such fine
架空光（电）缆支撑吊线宜用7股镀锌钢绞线。
