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【多选题】
对“0”层的正确描述是哪些？A.
是每个绘图文件中必须有的
B.
不能被删除，也不能被重命名
C.
它总是用实线绘制位且线型为bylayer的图元
D.
是AutoADC自动建立的
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反馈参考答案：
举一反三
【单选题】Why didn't the man go to the party?
A.
He was taking care of someone
B.
He had to handle something unexpected
C.
He was expecting someone to call him
D.
He had planned to do something else
【单选题】Why didn't the man get the class he wanted?
A.
He missed the registration deadline.
B.
The busy website help him up.
C.
The class was canceled.
D.
The Registration System was broken.
【单选题】Why didn't the man choose the Thursday lectures?
A.
He had another class to attend in that time period.
B.
No seat was available for the Thursday lectures.
C.
The professor who gave lectures on Thursday was too strict.
D.
He wanted to have the class tigether with his roommate.
【单选题】Why didn't the man accept the job?
A.
He doesn't enjoy business trips as much as he used to.
B.
He doesn't think he is capable of doing the job.
C.
He thinks the pay is too low to support his family.
D.
He wants to spend more time with his family.
【单选题】Why didn't the man return home after the war?
A.
He had been wounded in the war.
B.
The man hasn't told the woman yet.
C.
He had to sell newspapers at the railway station.
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