操作手持电动工具的工作场地、环境有何要求？
参考答案：
1.光线要充足；
2.导线无破损、老化；
3.漏电保护器安全可靠。
While our city tries impatiently to change its appearance by tearing down old buildings, more and
more citizens are suggesting ways to ____ the historically important architecture. [ ]
A. decorate
B. develop
C. preserve
D. advocate
下列哪项不属于生理
A．分娩时的出血约400ml
B．月经周期在21～35天之间
C．带经期为3～7天
D．产后12小时可开始哺乳
E．月经初潮年龄不超过18岁
