如图3-382所示刚架,位移△相同的是:()
A.(Ⅰ)与(Ⅲ)
B.(Ⅰ)与(Ⅳ)
C.(Ⅱ)与(Ⅳ)
D.(Ⅲ)与(Ⅳ)
参考答案:B
解析:
弹性结构,位移与力成正比,与刚度成反比。
18._________a US visitor visa twice, the old couple finally gave up their hope of going to America to experience Thanksgiving Day.
A.Having been refused
B.Being refused
C.Having refused
D.To be refused
以下哪种原料不属于制作毒品的半成品()。
A、大麻
B、鸦片
C、可卡因
D、大麻油