皮皮学，免费搜题
登录
搜题
【单选题】
由相对数指标计算平均数时，应采用( )A.
根据所掌握资料而定
B.
调和平均法
C.
算术平均法
D.
几何平均法
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】The poem “The Red Wheelbarrow” presents ordinary objects like “wheelbarrow” and “rainwater” as the images. What are the hidden symbolic meanings of them?
A.
Rainwater are gifts blessed by nature.
B.
Wheelbarrow is created by human beings, and it can symbolize the people’s diligence.
C.
The poet, by using these two images, appears to respect and acknowledge gratitude for nature.
D.
Wheelbarrow is a farming tool, and it can symbolize the miseries of the oppressed and poor working people .
【简答题】Zigbee片上系统的芯片的是_______。
【简答题】CC2530芯片是德州仪器研发的新一代ZigBee片上系统解决方案,建立在基于( )标准协议之上。
【简答题】Zigbee片上系统的芯片的是____
【简答题】ZigBee新一代SOC芯片 是真正的片上系统解决方案，支持IEEE 802.15.4标准/ZigBee/ZigBee RF4CE和能源的应用。