频率依赖性作用最强的是 ()
A.体温
B.实感温度
C.肌电
D.皮肤温度
E.脑诱发电位
参考答案:E
— Is there any ______ to the time that I can stay here?
— Yes, you must leave here before the headmaster comes back. [ ]
A. number
B. length
C. limit
D. matter
实验室需要制取一定量的氢气.现将金属锌放入适量盐酸中反应,生成的氢气体积为11.2L(STP),那么,参加反应的金属锌的质量是多少?