患者，女性，30岁。乳晕旁直径1.2cm圆形肿物，活动度可、边界清，挤压肿物， * * 溢出血性液体。

最恰当的检查应为（）.

A.乳腺超声检查

B.肿物穿刺活检

C.乳腺钼靶检查

D. * * 溢液细胞学检查

E.CT检查

(74) systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and (75) on the disk, and controlling peripheral devices such as disk drives and printers.

A．Operation

B．Operator

C．Operating

D．Operate