Addition, subtraction, multiplication, and division are binary operations.
加、
、乘、除都是二元运算。
, 法法;去;影血管造影；数字影血管造影术Addition, subtraction, multiplication, and division are binary operations.
加、、乘、除都是二元运算。
The difference is found by subtraction.
用法得出差额。
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
泪道阻塞中的应用价值。
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