皮皮学，免费搜题
登录
搜题
【单选题】
—I paid 200 dollars for the necklace. I think it's much too expensive. —Expensive? I don't agree with you. You so before you _______ it.A.
should have said; bought
B.
have said; bought
C.
had said; buy
D.
must have said; should buy
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】内源性凝血和外源性凝血的根本区别是
A.
前者发生在体内,后者发生在体外
B.
前者发生在血管内,后者发生在血管外
C.
前者的凝血因子都在体内,后者需加入体外因子
D.
前者由因子Ⅻ启动,后者由Ⅲ因子启动
【简答题】冯 · 诺依曼思想的关键是什么?
【简答题】焊接接头截面中 应力值与 应力之比,叫应力 系数。