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【简答题】
沥青的老化是指石油沥青在阳光、空气、水、热等外界因素的作用下,各组分之间会不断演变, 、 会逐渐减少, 逐渐增加。
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【单选题】Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
A.
that; to eat
B.
whether; to be eaten
C.
that; to be eaten
D.
whether; to eat
【单选题】The girl________ to milk since last winter.
A.
learns
B.
learned
C.
has learned
D.
would learn
【单选题】Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
A.
that; to eat
B.
whether; to be eaten
C.
whether; to eat
D.
that; to be eaten
【单选题】一船浮于静水中,船长L,质量为m,一个质量也为m的人从船尾走到船头,不计水和空气的阻力,则在此过程中船将
A.
不会动
B.
后退L
C.
后退0.5L
D.
后退三分之一L
【单选题】Milk quickly turns sour ______ it's in a fridge. [ ]
A.
until
B.
since
C.
as
D.
unless
【多选题】第七章29、旅行社未履行报告义务的()。
A.
由旅游主管部门责令改正。
B.
责令停业整顿，除两万元以上10万元以下罚款
C.
由旅游主管部门处5000元以上5万元以下罚款
D.
情节严重的，责令停业整顿，或者吊销旅行社业务经营许可证
E.
对直接负责的主管人员和其他直接责任人员除2000元以上，两万元以下罚款，并暂扣或者吊销导游证领队证
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