【单选题】They did researc h on how __________ their customers.
【判断题】若函数 在 处可导,则 在 处连续但不一定可导.
【判断题】若 , 在点 处都不可导,则 点 处也一定不可导
【判断题】临时轴是在创建圆柱和圆锥体是隐含生成的。 ( )
【单选题】Marconi moved to England because ______.
A.
he did not get financial support for his research in Italy
C.
his research had to be conducted in England
D.
his research fellow was in England
【简答题】面团俗称热粉,因其在调制过程中要求的温度较高。
【简答题】A.but did not take B.but do not take C.what did not take D.what was not taken