下列不属于哺乳动物的是()。
A.蝙蝠
B.鲸
C.蜂鸟
D.海豹
参考答案:C
解析:
蜂鸟属于鸟类.鸟类与哺乳动物的区别在于,哺乳动物属于胎生,鸟类属于卵生。
The parents felt helpless when they found their son had ____ love stories for long.
[ ]
A. addicted
B. addicted to
C. addicted himself
D. been addicted to
常闭式制动器在机构不工作时,制动器处于()状态。
A、抱闸
B、松闸
C、随机