题目内容

I've been here for only two weeks.

A. since only two weeks
B. since only two weeks ago
C. in only two weeks

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It took me some time to learn the American way of living.

A. I spent some time learning
B. It cost me a lot of time to learn
C. I paid some time to learn

指出下列平面的特点：1） 2x+3y=02)x-y-z=03) 2y-3z-4=04) y-3=0

汉文帝时期，汉朝政府首次尝试垄断经营盐和铁。

A. 对
B. 错

稳压二极管稳压时工作在伏安特性的______区。

A. 正向导通
B. 反向截止
C. 反向击穿
D. 以上答案都错