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【多选题】
直流电动机工作特性包括以下哪几个?A.
转速特性
B.
效率特性
C.
转矩特性
D.
机械特性
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】从工程机械上拆一蓄电池时,首先应该拆下 电缆;将蓄电池安装在工程机械上时,应首先安装 电缆。( )
A.
负极 正极
B.
正极 负极
C.
正极 正极
D.
负极 负极
【单选题】Mr. Wang is very strict ________ his son, and also, he is very strict ________ his job.
A.
with; with
B.
with; in
C.
in; in
D.
in; with
【单选题】已知项目盈亏平衡时的产量是8万件,项目达产时的产量是12万件,产品销售单价是68元,则项目的生产能力利用率为( )
A.
150%
B.
66.67%
C.
8万件
D.
12万件
【简答题】阅读理解。 Wang Lei is a Chinese taxi driver. He has a son. His name is Wang Hong. He is in No. 14 Middle School. Mr Brown is his English teacher. He loves his student, and Wang Hong studies English well. ...
【简答题】阅读并回答问题 Wang Lei is a Chinese taxi driver. He has a son. His name is Wang Hong. He is in No.14 Middle School. Mr Brown is his English teacher. He loves his student, and Wang Hong studies English well....
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