曾发生于日本的镉危害引起的公害病是()
A.水俣病
B.贫血
C.痛痛病
D.肿瘤
E.肝脏坏死
参考答案:C
解析:镉中毒可引起以骨关节疼痛为主要症状的地方病。
You look smart in this new jacket. That old one ______ thrown away many years ago.
A.ought to be
B.ought to have been
C.would be
D.would have been
货物列车速度在()以下的不得缓解列车制动。
A、10km/h
B、12km/h
C、15km/h
D、20km/h