宝石折射仪的精度是：（）.A.±0.005 B.±0.001 C.±0.01_爱下问搜题

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问题单项选择题

宝石折射仪的精度是：（）.

A.±0.005

B.±0.001

C.±0.01

答案

参考答案：A

选择题

His report was so exciting that it was __ interrupted by applause（掌声）.

A．constantly

B．constant

C．seldom

D．never

问答题简答题

试述进水口有哪几种类型？各适用于什么条件？