多项选择题

齿轮啮合间隙检查的方法有（）
A、塞尺法
B、千分尺法
C、压铅丝法

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单项选择题

After the“9/11”tragedy, the Bush Administration created ________________in order to strengthen border security.

A．the Department of State
B．the Department of Homeland Security
C．the Department of Education
D．the Department of Health and Human Service

单项选择题

在药物重金属检查法硫代乙酰胺法中，溶液的pH在
A、3～3.5
B、7
C、4～4.5
D、8