低钾血症最早的表现是（）
A.口苦
B.恶心、呕吐
C.肌无力
D.肠麻痹
E.心电图出现T波降低、变宽、倒置等
参考答案：C
He gave us another piece of advice, ________ of great help to the research work.
A．which I think is
B．which I think it is
C．I think which is
D．I think it is
厌氧菌天然耐受的物质是 （）
A.胆汁
B.氨基糖苷类抗生素
C.甲硝唑
D.聚茴香脑磺酸钠
E.氯林可霉素
