词有单义词和多义词。下列词语为多义词的是()
A.导弹
B.沙发
C.武器
D.电脑
参考答案:C
The CEO needs an assistant with _____ little knowledge of German and ____ experience in administrative
management. [ ]
A. the, an
B. the, /
C. a, an
D. a, /
在题后横线上简要说明下列操作可能造成的不良后果.
(1)倾倒细口瓶里的药液时,标签没向着手心:______;
(2)加热后的试管直接放在实验台上______;
(3)用试管刷刷洗试管时,用力过大:______;
(4)用100mL的量筒量取5mL盐酸:______;
(5)加热盛固体的试管时,试管口高于试管底:______.