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问题 多项选择题

仪表设备安装应遵循的程序是（）。

A.先里后外

B.先外后里

C.先高后低

D.先低后高

E.先重后轻

答案

参考答案：A, C, E

填空题

（）是分化的第一步。
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单项选择题

Soon, more of the information we receive via the Internet could come (155) in digital wrappers.
Wrappers are made up, (156) software code that’s targeted to do specific things with the data (157) within them, such as helping to define queries for search engines. They also keep (158) from (159) access to that code.

A．gain

B．gained

C．gains

D．gaining
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