普通胶合板按（）分为Ⅰ类、Ⅱ类、Ⅲ类胶合板。A、加工缺陷的范

搜题请搜索小程序“爱下问搜题”

问题单项选择题

普通胶合板按（）分为Ⅰ类、Ⅱ类、Ⅲ类胶合板。

A、加工缺陷的范围

B、可见的材质缺陷

C、加工缺陷的数量

D、使用环境条件

答案

参考答案：D

选择题

— What did Jack ask you just now?

— He wanted to know how long _____ when I reached the cinema. [ ]

A. had the film been on

B. the film had started

C. the film had lasted

D. had the film ended

判断题

Tn10是高水平表达转座酶。