面颊瘦削,面色灰褐,额部、鼻背、双颊有褐色色素沉着,见于
A.恶性肿瘤
B.贫血
C.慢性肾病
D.甲状腺功能减退
E.慢性肝病
参考答案:E
一般情况下,外存储器中存储的信息,在断电后________。
A.局部丢失
B.大部丢失
C.全部丢失
D.不会丢失
—Why didn’t you try your best to get on the bus?
—I tried to , but _______ I could, it started moving.
A.before
B.when
C.until
D.after