触电时通过人体的电流如果超过一定数值将造成伤亡.对于工频电流讲,这个数值是()
A、0.1mA;
B、1mA;
C、10mA;
D、100mA
参考答案:D
用所给单词的正确形式填空
1. __________(sandwich) are very delicious. I like them.
2. What do we need __________(make) a banana milk shake?
3. How many __________(cup) of yogurt do you want?
4. Mum is __________(cut) up onions in the kitchen.
5. Do you like __________(tomato) in your sandwich?
由定距尺度计量形成的统计数据是()。
A.分类数据
B.定量数据
C.顺序数据
D.定性数据