题目内容

简述电阻、电感和电容元件上的电流与电压数值及相位关系，并作出它们的电压与电流相量图。

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1. She is tied to her smartphone she even uses to text a friend who lives one floor above her.

A. who
B. which;或不填
C. by which
D. where

Colleges began embracing Internet access in the mid -1990s, many began wiring dorms with high-speed connections.

A. where
B. when
C. which
D. that

Colleges around the world their computer systems for the past decade, in large part to provide students with the most advanced free system.

A. has been replacing
B. have replacing
C. have been replacing
D. arereplacing

Professors have been encouraged totheir lectures andthem online.

A. recording post
B. wireemail
C. tapepost
D. text instant-massage