【简答题】尖轨与基本轨的贴靠方式通常有两种,即()与()。
【简答题】尖轨与基本轨的贴靠方式通常有两种,即贴尖式与( )。
【单选题】---- You’re coughing badly, Martin.Why not give up smoking? ---- Give up smoking? Easier said than done, Amy.Once you _____ the habit of smoking, it is very hard for you to______.
A.
keep up; break it away
C.
pick up; get rid of it
D.
build up; do away with it
【单选题】有一桥墩,埋置在厚度为3米的不透水粘土层顶面,粘土层下面为深厚的粉细沙层,当河水水位上涨2米时,试问桥墩沉降变化为( )。
【简答题】在Factory类中需要声明数据集合,如果数据类型为Book,则数据集合的类型应该声明为______