溜放作业中,使用手制动机制动时一般按()等过程进行。
A.选闸、试闸、拧闸
B.选闸、磨闸、拧闸
C.选闸、试闸、磨闸、拧闸
D.选闸、试闸、顿闸、拧闸
参考答案:C
Not only Jim but also Tom ________ not here. They both went to Shanghai last week. [ ]
A. are
B. were
C. is
D. was
患者女,45岁。因反复恶心、呕吐伴乏力3个月就诊,无腹痛、腹泻,无发热、咳嗽,无胸闷及呼吸困难。患者自发病以来,体重减轻12kg。血常规、肝功能、肾功能及血糖均正常。血K+3.8mmol/L,Na+125mmol/L,Cl-87.0mmol/L,Mg2+1.0mmol/L。心电图未见异常。胃镜检查显示“慢性浅表性胃炎”。
患者存在的电解质紊乱为()
A.低钾血症
B.高钾血症
C.低钠血症
D.高钠血症
E.低镁血症
F.高镁血症