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【单选题】
下列有工作的叙述中,错误的是( )。A.
虚工作指标是工作之间的逻辑关系
B.
混凝土养护可用虚工作表示
C.
只有双代号网络图中工作
D.
虚工作一般用虚箭线表示
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A.
Why people hold back their tears.
B.
Why people cry.
C.
How to restrain one's tears.
D.
How tears are produced.
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A.
why it was that
B.
it was why that
C.
why was it that
D.
that it was why
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