制定劳动定额的依据有哪几方面？
参考答案：
制定劳动定额的依据有技术依据、经济依据、心理和生理依据等方面。
The young boy has come to himself in hospital now. But he ___ unconscious for three days.
A．has been
B．was
C．had been
D．is
在使用滚杠运输设备时，旋转滚杠时可以戴手套。
