关于管道内壁涂层说话错误的是（）。
A.降低出站压力
B.延长管道使用寿命
C.减少杂质附着
D.减缓腐蚀速率
参考答案：A
汞中毒治疗时用（）
A.依地酸二钠钙
B.亚甲蓝
C.二巯基丙磺酸钠
D.解磷定
E.亚硝酸钠-硫代硫酸钠疗法
Tom’s farther, for ________life had once been very hard, got success later in his job.
A．which
B．whose
C．whom
D．who
