危险废物的定义?
参考答案:
危险废物是指列入国家危险废物名录或者根据国家规定的危险废物鉴别标准和鉴别方法认定的具有危险特性的废物。
分别写出下列各组命题构成的“p或q”“p且q”“非p”形式的复合命题:
(1)p:连续的三个整数的乘积能被2整除, q:连续的三个整数的乘积能被3整除.
(2)p:对角线互相垂直的四边形是菱形, q:对角线互相平分的四边形是菱形.
The reason_______ so many people rushed to California was ______ another gold mine was found in California.
A.that; because
B.why; that
C.that; why
D.why; because