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【判断题】
地基基础设计等级为甲级, 桩身完整性抽检桩数不应少于总桩数的30%，且不得少于20根A.
正确
B.
错误
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【简答题】A．It is a social fact. B．It doesn't exist. C．It is natural. D．It is a problem, especially to young people:
【简答题】When ______, the problem of unemployment will arise.
【简答题】When you eat out the language problem is ______ .
【单选题】Scarcity would cease to exist as an economic problem if:
A.
we learned to cooperate and not compete with each other.
B.
there were new discoveries of an abundance of natural resources.
C.
output per worker increased.
D.
none of the above.
【单选题】What problem does the author think exist within education?
A.
That disciplines are taught as separate subjects
B.
That it doesn’t prepare students for the jobs of today and the future
C.
That there exist ‘silos’ within education
D.
All of the above
【单选题】In determining if risk of collision exists， such risk may sometimes exist even when an appreciable bearing change is evident， particularly when approaching ________ ．
A.
very large vessel
B.
a long tow
C.
a vessel at close range
D.
all A，B and C
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