【简答题】专属经济区是指在沿海国家和岛屿,()海里范围内享有对自然资源及其勘探开发的主权和权益,同时还可以进行科学研究和环境保护。
【单选题】It wasn't until ______ that he started getting back to his hotel for lunch.
A.
he had determined to ask the way
B.
he had realized that the only word he knew was the name of the street where his hotel was located
C.
he had enjoyed himself there for a couple of hours
D.
he had visited a small book store
【多选题】有关甲醛溶液说法正确的是
C.
低温时甲醛容易发生聚合反应生成多聚甲醛白色沉淀,因此要注意防冻
【多选题】关于换热器冬季防冻,下列说法正确的有()。
A.
所有与冷却水管线相连的换热器,不管是否使用均需保证冷却水畅通,不得中断
B.
未投用的蒸汽加热器通入少量蒸汽,凝液由导淋排出
【单选题】The hotel in Nanchong wasn’t particularly good. But I ____ in many worse hotels.
【简答题】数据对象包含三类, 信号 、变量和 ____________ 。