Addition, subtraction, multiplication, and division are binary operations.
加、
、乘、除都是二元
。
, 法法;
;
术;;，计数;影血管造影；数字影血管造影术Addition, subtraction, multiplication, and division are binary operations.
加、、乘、除都是二元。
The difference is found by subtraction.
法得出差额。
Objective:To illustrate the value of digital subtraction dacryocystography in the diagnosis of lacrimal duct obstruction.
评价数字影泪道造影术在临床检查泪道阻塞中的应价值。
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