题目内容

某工程单目标双代号网络计如下图所示，图中的错误是()。

A. 有多个起点节点
B. 有多个终点节点
C. 有双向箭头联线
D. 有循环回路

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[A] over
[B] around
[C] fast
[D] all day

20 Radiocarbon is reliable in dating an object back to at least 50,000 years.
A Right
B Wrong
C Not mentioned

[A] true
[B] belief
[C] richness
[D] interest

[A] going over
[B] to go over
[C] go over
[D] our going over