一级化学防化服是消防员处置液态化学危险品和腐蚀性物品以及缺氧现场环境下实施救援任务时穿着的化学防护服。
参考答案：错
The river______ are covered with trees is polluted.
A．of which the banks
B．whose banks
C．the banks of which
D．A,B,C are right
佝偻病活动期的主要临床表现是()
A．精神神经症状、夜惊、烦躁
B．骨骼系统改变
C．出汗多
D．反复无热惊厥
E．手足搐搦
