【判断题】Though slower thanother than other modes , water transport is relatively inexpensive.
【单选题】Ships are ____ than planes that people take them mainly for pleasure. A. very much slower B. so much slower C. too much slower D. much more slower
【判断题】Though slower than other modes,water transport is relatively inexpensive.
【判断题】基性接触变质岩的原岩有可能是铁质白云质的泥灰岩。 ( )
【单选题】与大豆相比,大豆发芽后能增加的一种营养素是( )
【单选题】满足理想气体 pv n =常数且 n =±∞的过程是 。
【单选题】It is implied that the process of aging is ______.
A.
slower in a healthy man
B.
slower in a healthy woman
C.
at the same rate with men and women
D.
hard to compare in terms of sex
【判断题】如果某个字段在定义时添加了非空约束,但没有添加default约束,那么插入新记录时就必须为该字段赋值,否则数据库系统会提示错误。