设备工程投资的特点包括()。
A.大额性
B.单件性
C.阶段性
D.科学性
E.节约性
参考答案:A, B, C
In ancient times, people rarely travelled long distances and most farmers only travelled ________
the local market. [ ]
A. longer than
B. more than
C. as much as
D. as far as
如图所示,梯形ABCD,AD∥BC,DE⊥BC,现在假设AD、BC的长度都减少10%,DE的
长度增加10%,则新梯形的面积与原梯形的面积相比,会怎样变化()
A.不变
B.减少1%
C.增加10%
D.减少10%