不漏水不漏气,发酵正常的沼气池都是病态池。
参考答案:错
During the next ten years, she had to work hard _____ for the necklace.
A.paying
B.to pay
C.for paying
D.in order to paying
发生中毒可引起皮肤发绀的药物不包括()
A.苯胺
B.强酸
C.硝基苯
D.麻醉药
E.亚硝酸盐