常用斗轮有()结构形式。
A、有格式;
B、无格式;
C、取料式;
D、堆料式。
参考答案:A, B
做一个圆柱形的通风管,至少需要铁皮的面积是求圆柱[ ]
A.侧面积
B.侧面积+一个底面面积
C.表面积
The present_______my desk mate gave me_______more than 100 yuan. [ ]
A. that ; spent
B. who ;took
C. which ; cost
D. /; paid